Follow-up to post #45.
The link that was provided to the Lahman list of online references is incomplete in some respects. Since there seems to be some interest from others in these references, let me pass along some information on the topic which might be useful.
For Reach Guides, the Lahman links do not include issues for odd-numbered years from 1901-07, as well as missing 1913, 1917, and 1919. These issues can in fact be found online
at the Smithsonian Libraries. They're part of double-issue PDF files, e.g. 1900-1901 are in the same file, 1902-03 are in the same file, etc. By using that link you'll have a complete run of Reach Guides from 1900-1921.
For the 1934 and 1939 Spalding Baseball Guides, the former can be
viewed online here, while the latter can be
viewed online here.
The Spalding National Association Guides
can be found here with some searching. You'll notice the same title is listed in the search results multiple times, but if you click on the links it will often take you to a different year's issue from what the link lists. If you go through the search links, and play around a bit with search terms, you will eventually get all the National Association Guides issues listed in post #45.
The Spalding Baseball Record guides
can be found here with some searching. Scroll down that page and you'll eventually see the links for the Baseball Record. As before, you may have to play around with the search terms a bit and try out all the search result links.
(Spalding did indeed put out three different guides, though naturally there was some overlap in the information they contained.)