You can still buy an Ames Lettering Guide! They are cheap, too. I used one in college drafting classes and also when I drew comics for bOING bOING. I think I still have it around somewhere. In this video by our friends at Cartoonist Kayfabe, Jim Rugg uses an Ames Lettering Guide as part of his excellent comic book hand lettering guide. Jim is one of the best letterers around. Most cartoonists use computer fonts, so it's a treat to see Jim letter with an ink pen.
Great guide to hand-lettering comics