This collection is an attempt to gather all of the documentation needed to start programming the CoCo in any given language.
All of these items can be found elsewhere, but it can be difficult to sort through the many possible locations and multiple versions to find what you need.  In addition to (hopefully) finding the most current versions, I've optimized the PDFs for size and readability and performed Clearscan OCR on most. Using Google Docs, these references can be quickly viewed and searched online.

In addition to the references found here, be sure to check out the NitrOS9 Documentation Wiki.

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6801, 68701, and 6803 Microcomputer Programming and Interfacing by Andrew C. Staugaard, Jr. (1980)  20612k v. 3 Sep 10, 2010, 8:34 PM Aaron Wolfe
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6809 Assembly Language Programming, by Leventhal  26252k v. 2 Aug 14, 2011, 9:57 AM Aaron Wolfe
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6809 Microcomputer Programming & Interfacing With Experiments  11139k v. 2 Nov 22, 2015, 4:58 PM Aaron Wolfe
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Motorola 6809 and Hitachi 6309 Programming Reference. Detailed documentation of the 6x09 instruction set, by Darren Atkinson  504k v. 4 Apr 25, 2010, 11:17 PM Aaron Wolfe
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An Addendum to Assembly Language Programming For The TRS-80 Color Computer. By Laurence A. Tepolt  2927k v. 3 Apr 25, 2010, 3:43 AM Aaron Wolfe
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Assembly Language Programming For The TRS-80 Color Computer, plus a users guide to EDTASM+. by Laurence A. Tepolt  8468k v. 3 Apr 25, 2010, 3:41 AM Aaron Wolfe
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Color Computer Memory Map, Version 2.0, Bob Russell 1983  5452k v. 2 Apr 18, 2011, 5:38 PM Aaron Wolfe
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Disk EDTASM manual  5620k v. 2 Nov 27, 2011, 6:58 AM Aaron Wolfe
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Dragon 32 Information for Machine Code Users  1861k v. 3 Apr 24, 2010, 11:02 PM Aaron Wolfe
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MC6809-MC6809E 8-Bit Microprocessor Programming Manual  3999k v. 3 Apr 24, 2010, 11:11 PM Aaron Wolfe
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MC6829 MMU spec sheet  411k v. 2 Oct 21, 2013, 6:46 AM Aaron Wolfe
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A comprehensive guide to 6809 instruction set and registers - Storing data to memory - Condition codes - Addressing and branching - Subroutines - Arithmetic operations - ROM subroutines - Graphics and sound   10996k v. 4 Apr 26, 2010, 2:19 AM Aaron Wolfe
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Microware BASIC09 Manual   2493k v. 4 Jan 10, 2011, 8:00 PM Aaron Wolfe
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Dragon BASIC09 Manual  522k v. 3 Apr 24, 2010, 10:56 PM Aaron Wolfe
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Tandy BASIC09 Manual  3021k v. 4 Apr 24, 2010, 1:50 PM Aaron Wolfe
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Your Introduction to BASIC09, a State-Of-The-Art Programming Language from MICROWARE, by Dale L. Puckett   20189k v. 5 Apr 26, 2010, 2:20 AM Aaron Wolfe
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Microware C Compiler Users Guide (with some useful handwritten notes) OCR  7554k v. 7 Aug 26, 2011, 5:53 PM Aaron Wolfe
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The C Programming Language, 2nd edition, by Brian W. Kernighan and Dennis M. Ritchie.  956k v. 2 Aug 26, 2011, 6:30 PM Aaron Wolfe
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List of bugs found in the Microware C compiler  4k v. 2 Apr 25, 2010, 9:50 PM Aaron Wolfe
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C Reference Manual by Dennis M. Ritchie  169k v. 3 Apr 24, 2010, 9:37 PM Aaron Wolfe
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Getting started with the cgfx functions and improving your systems with a fast compiler utility. by Numa David  112k v. 3 Apr 24, 2010, 9:34 PM Aaron Wolfe
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Color BASIC Unravelled II - Originally by Spectral Associates, converted to PDF by Walter K. Zydhek  1022k v. 3 Apr 25, 2010, 8:51 PM Aaron Wolfe
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Tandy Color Computer 3 BASIC Quick Reference  851k v. 3 Apr 25, 2010, 8:51 PM Aaron Wolfe
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Tandy Extended BASIC manual  25260k v. 3 Apr 25, 2010, 8:53 PM Aaron Wolfe
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Color Computer Disk Owners Manual and Programming Guide  6772k v. 3 Apr 18, 2011, 5:19 PM Aaron Wolfe
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Disk BASIC Unravelled II - Originally by Spectral Associates, converted to PDF by Walter K. Zydhek  1278k v. 4 Apr 25, 2010, 8:52 PM Aaron Wolfe
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An introduction to BASIC programming using the Dragon, by Richard Wadman  1687k v. 3 Apr 25, 2010, 8:54 PM Aaron Wolfe
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Extended BASIC Unravelled II - Originally by Spectral Associates, converted to PDF by Walter K. Zydhek  1046k v. 3 Apr 25, 2010, 8:54 PM Aaron Wolfe
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ECB manual that came with the Coco 2  15503k v. 3 Nov 26, 2011, 9:12 PM Aaron Wolfe
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Super Extended BASIC Unravelled II - Originally by Spectral Associates, converted to PDF by Walter K. Zydhek  907k v. 3 Apr 25, 2010, 8:55 PM Aaron Wolfe
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Introduction, DOS, Utilities, and Advanced Programming Guide  16264k v. 3 Mar 29, 2012, 1:11 PM Aaron Wolfe
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MicroWorks ColorForth manual  11072k v. 3 Nov 27, 2011, 7:00 AM Aaron Wolfe
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Forth09 Manual  2875k v. 3 Nov 27, 2011, 7:00 AM Aaron Wolfe
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Getting Started With NitrOS-9  963k v. 3 Jan 11, 2011, 1:52 PM Aaron Wolfe
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NitrOS-9 Operating System User's Guide  840k v. 3 Jan 22, 2011, 10:53 PM Aaron Wolfe
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The NitrOS-9 Level 2 Windowing System  499k v. 3 Jan 11, 2011, 1:52 PM Aaron Wolfe
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NitrOS-9 Technical Reference  1542k v. 3 Jan 11, 2011, 1:52 PM Aaron Wolfe
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Inside OS-9 Level II - The Inside Story of OS-9 For The Tandy Color Computer 3 by Kevin K. Darling  6801k v. 4 Jan 11, 2011, 2:11 PM Aaron Wolfe
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An enjoyable, hands on guide to OS9 Level 2 complete with step by step tutorials  619k v. 3 Jul 25, 2010, 8:40 PM Aaron Wolfe
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MultiVue for OS-9 Level II  5316k v. 4 Apr 25, 2010, 4:45 PM Aaron Wolfe
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OS-9 Editor/Assembler/Debugger Users Manual  1210k v. 4 Apr 25, 2010, 3:43 AM Aaron Wolfe
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OS-9 Level II Commands Reference  7627k v. 2 Nov 27, 2011, 5:11 AM Aaron Wolfe
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OS-9 Level II - Getting Started with OS-9  2104k v. 2 Nov 27, 2011, 5:25 AM Aaron Wolfe
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OS-9 Level II Technical Reference  8652k v. 2 Nov 27, 2011, 5:11 AM Aaron Wolfe
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OS-9 Level II Windowing System manual  1602k v. 2 Nov 27, 2011, 5:18 AM Aaron Wolfe
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OS-9 Operating System: System Programmers Manual - Microware  617k v. 3 Apr 24, 2010, 10:18 PM Aaron Wolfe
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OS-9 Operating System Users Guide for Dragon  614k v. 3 Apr 24, 2010, 10:49 PM Aaron Wolfe
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A collection of excellent articles written for 68 Micro Journal. By Peter Dibble  8878k v. 3 Apr 24, 2010, 10:30 PM Aaron Wolfe
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The Complete Rainbow Guide to OS-9, by Dale Puckett and Peter Dibble  5985k v. 3 Feb 2, 2011, 10:48 PM Aaron Wolfe
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The Complete Rainbow Guide to OS-9 Level II - Volume 1, A Beginners Guide to Windows. by Dale Puckett and Peter Dibble   7551k v. 6 Apr 24, 2010, 10:46 PM Aaron Wolfe
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OS-9 Pascal Reference Manual  4659k v. 2 Nov 26, 2011, 9:40 PM Aaron Wolfe