One of my favorite things to do in Charleston is to browse the lovely shelves of Blue Bicycle Books! One of my recent finds is a copy of Photo-Lettering's One Line Manual of Styles!
Photo-Lettering was a company founded in 1936 and continued to operate until 1997. Its popularity exploded because designers could set text and titles much faster using photo lettering than any other options available.
Type Token has a much more detailed history of the process, along with drool-worthy type spec pages from other publications; and Forgotten New York has a wonderful peak behind the curtain of what it was like to work for PLINC during the 1980s.
Nowadays the keepers of all things photo-lettering are House Industries. After acquiring the library they set up a website for modern-day users to set type (almost) just like the old times! The story of them purchasing the library is quite entertaining: