Edison Phonograph Monthly (which was a periodical monthly business magazine specifically tailored toward those who sold Edison products that was published between March 1903 to December 1916. From E.P.M., I found 2,001 companies/stores).
Antique Phonograph Advertising - by Timothy C. Fabrizio and George F. Paul (an illustrated book published in 2001 which covered the general history of advertising early recorded music from the end of the 19th century to the mid-to-late 1920's. From A.P.A., I found 20 companies/stores).
The Phonoscope (another periodical monthly magazine publication dedicated to presenting "scientific and amusement inventions," as mentioned by worldradiohistory.com, between November 1896 to December 1899. Even though many of the Edison products mentioned within the publication came from exhibitors and their nickelodeon exhibitions, many of those same exhibitors would go on to become the first dealers/jobbers for the National Phonograph Co. Other exhibitors mentioned in the proceeding tables are included due to their specific push towards using the National Phonograph Co.'s 'Edison nickel-in-the-slot phonographs.' From the Phonoscope, I found 49 exhibitors/stores).
Talking Machine World (another periodical monthly magazine that was generally tailored toward those in the overall phonograph and recorded-music-selling business rather than one specific business- i.e., stores that would sell Edison, Victor, Columbia, and other record labels rather than one specific label like that in the Edison Phonograph Monthly. T.M.W. was published between January 1905 to, probably, December 1929. Due to the expanding presence of phonographs in the Great War years, and later the radio business in the late 20's and early 30's, the publications, as stated by worldradiohistory.com, "were routinely over 200 pages in length." With this expanding presence, in 1929 the magazine was renamed to the Talking Machine & Radio Music Merchant, and once again to Radio Merchant in 1930. With Edison halting production of records and phonographs by the end of the 1920's, anything found in the publication after 1929 has produced no information, as far as I can find, on any Edison dealer or jobber. From T.M.W., I have found 1,479 companies/stores).
Other, Smaller Sources (these were loose sources I found either from individual advertisements online- such as from Pinterest or Alamy- or from the survey I conducted a month ago where individuals reported any unique markings on their Edison phonographs or records that indicated an address or company/store name from where that specific phonograph came from. From these smaller sources, I have found 5 companies/stores).
Academic Sources used for the Edison Business History Page:
[15] Bruderhofer, N. (1970). Edison wax cylinders for sound recording. Retrieved from https://lateralscience.blogspot.com/2012/09/edison-wax-cylinders-for-sound-recording.html
[3] Cylinder Preservation and Digitization Project. (2005). Retrieved from https://cylinders.library.ucsb.edu/history-brownwax.php
[4] Cylinder Preservation and Digitization Project. (2005a). Retrieved from https://cylinders.library.ucsb.edu/history-goldmoulded.php
[5] Cylinder Preservation and Digitization Project. (2005b). Retrieved from https://cylinders.library.ucsb.edu/history-amberol.php
[7] Cylinder Preservation and Digitization Project. (2005c). Retrieved from https://cylinders.library.ucsb.edu/history-blueamberol.php
[11] Day, T. (2000). A century of recorded music: Listening to musical history. Yale University Press.
[12] DeGraaf, L. (1995). Confronting the Mass Market: Thomas Edison and the Entertainment Phonograph. Business and Economic History, 24(1), 88–96. http://www.jstor.org/stable/23703274
[8] History of the Edison Disc Phonograph: History of Edison Sound Recordings: Articles and essays: Inventing entertainment: The early motion pictures and sound recordings of the Edison Companies: Digital Collections: Library of Congress. (n.d.-a). Retrieved from https://www.loc.gov/collections/edison-company-motion-pictures-and-sound-recordings/articles-and-essays/history-of-edison-sound-recordings/history-of-the-edison-disc-phonograph/
[13] Hoffmann, F. (2004). Encyclopedia of recorded sound. Retrieved from https://books.google.com/books?id=-FOSAgAAQBAJ&pg=PA703#v=onepage&q&f=false
[18] Moore, W. (n.d.). The Edison Phonograph Monthly [Mar 1903-Feb 1904]: Media history digital library. Retrieved from https://mediahistoryproject.org/reader.php?id=edisonphonograph01moor
[6] Moore, W. (n.d.). The Edison Phonograph Monthly [Jan-Dec 1908]: Media history digital library. Retrieved from https://mediahistoryproject.org/reader.php?id=edisonphonograph06moor
[15] (N.d.). Retrieved from https://www.friendsofthephonograph.org/Factola/Edison%20Tone%20Tests.htm
[16] (N.d.). Retrieved from http://www.myvintagetv.com/edison_c1.htm
[2] National Phonograph Company, Ltd. (n.d.). Retrieved from https://edison.rutgers.edu/life-of-edison/companies/company-details/phonograph,-foreign/national-phonograph-company-ltd
[1] North American Phonograph Company: Historical background: Tools & Resources: National recording preservation plan: Programs: Library of Congress. (n.d.). Retrieved from https://www.loc.gov/programs/national-recording-preservation-plan/tools-and-resources/historical-background/north-american-phonograph-company/
[14] Rondeau, R. (n.d.). Edison “H” Coin-Operated Phonograph. Retrieved from https://edisontinfoil.com/edisonh.htm
[9] Talking-machine-1912-05.PDF. (n.d.). Retrieved from https://worldradiohistory.com/Archive-Talking-Machine/10s/Talking-Machine-1912-05.pdf
[10] Talking-machine-1921-06.PDF. (n.d.). Retrieved from https://www.worldradiohistory.com/Archive-Talking-Machine/20s/Talking-Machine-1921-06.pdf
[17] Thomas Edison. [Between 1870 and 1880] Photograph. Retrieved from the Library of Congress, <www.loc.gov/item/2017893349/>.