Was poking around archive.org last night and gathered up a few interesting links. Some of these go way back to a time when tobacco/cigars were a huge part of the economy.
Some samples below and of course you can do your own searches.
Want to know how much raw tobacco it takes to make N quantity of cigars? This one is for you.
Knollenberg's tables for the use of cigar manufacturers and cigar makers
by Knollenberg, William E. [from old catalog]
Published 1896 LINK
Employment of Women in Industries: Cigar-Making: Its History and Present Tendencies
by Abbott, Edith
Published January 1, 1907 LINK
For you maduro cigar lovers.
Tobacco curing and resweating for quality and dark colors. A practical hand-book for cigar manufacturers and leaf dealers who are licensed to use the patents of Charles S. Philips ..
by Philips, Charles S. [from old catalog]
Published 1882 LINK
Cigar makers' official journal
by Cigar Makers' International Union of America
Published 1875 LINK
Curing and Fermentation of Cigar Leaf Tobacco
by Oscar Loew, i.e . Carl Benedikt Oscar Loew
Published 1899 LINK
The US Library of Congress has a lot of online collections as well. The site is a bit buggy right now but I've found complete books, photos, ads, artwork that were cigar related in the past.
Search via this link -> https://www.loc.gov/collections/