Latin Grammar Books
These grammars are free to download and detailed, although their understanding of language from a theoretical point is naturally dated. Details of Latin grammar is not equally important to all students of the Ancient World, yet decent reference works of the minutiae of usage is often indispensable when struggling with a difficult problem.
Gildersleeve's Latin Grammar (Gildersleeve, Basil L., and Gonzalez Lodge. 2005. Latin grammar. London: Bristol Classical Press.)
This is one of the big old grammars of the nineteenth century. Complete, meticulous and dense, but based on a slightly antiquated idea of grammar.
Kennedy's Revised Latin Grammar (Kennedy, Benjamin Hall. 1888. The revised Latin Primer. London: Longmans & Co.)
Another nineteenth century grammar. Mainly intended for use in schools this grammar is more user friendly than Gildersleeve's (though not as complete). A highlight is the chapter on prosody at the end.
Allen and Greenough's New Latin Grammar (Allen, Joseph Henry & Greenough, J. B. 1903. Allen and Greenough's New Latin grammar for schools and colleges. Boston: Ginn & Co.)
This is the grammar book used in the notes to the Richie texts read in second year. Besides downloading the book for free it is also usable in Perseus which hosts the text with hyper-links to its large Lewis and Short dictionary.
Bennet's New Latin Grammar (Bennett, Charles E. 1918. New Latin grammar. Boston: Allyn and Bacon.)
Another excellent grammar not under copyright. This grammar is also available hyperlinked from The Latin Library.
Harkness' Latin Grammar (Harkness, Albert. 1898. A complete Latin grammar. New York: American Book Co.)
Greek Grammar Books