The essay “Civil Type” by Vladimir Yefimov, published in the book Language Culture Type discusses the Petrine reforms and how the original Civil Type was produced. There’s also some commentary about a contemporary Cyrillic by Yefimov.

The Zhukov article is a splash of historical information, some images highlighting common aspects of the typographic forms, and tables examining shape relationships across the Cyrillic, Green, and Latin alphabets. The last item is something that one can figure out by looking at a good multi-script font. There are two copies of the Zhukov article at libraries in New York, one at the public library and one at Columbia University’s Butler library. Both are unfortunately in appointment-only rare books collections. The public library makes rare book access a huge PITA and won't let researchers make copies. Unless you’re having a really hard time wrapping your head around Latin/Greek/Cyrillic type design it’s probably not worth the effort it takes to access a copy.

The "Book of Letters", as far as I can see, is impossible to get anywhere, but I'll try to track Language Culture Type down. Would you say it is worth buying?

I’m specifically interested in Peter the Great’s reforms, the 1917 reforms, and anything on Ivan Fyodorov.

One good study of the origins of the contemporary Cyrillic is Ivan Káldor’s essay “The genesis of the Russian grazhdanskii shrift or Civil Type” (Cleveland), printed in The Journal of Typographic Research, no. 3.4, of October 1969, and no. 4.2, of April 1970.

More recently, James Cracraft wrote about Peter’s typographic reform in his monograph The Petrine Revolution in Russian Culture (Cambridge, MA: Belknap Press of Harvard University Press, 2004), pp. 257–275.

Strictly speaking, there was no “1917 reforms” in Russian typography. There was a spelling reform decreed by the new, Soviet government: it legally went into effect on January 1, 1918. Curiously enough, that decree, dated December 23, 1917, was published only on October 13, 1918.

The 1918 spelling reform of the Soviet Government, however, could be deemed as much a typographical reform as the 1708 one by Peter the Great, because both of them removed several letters from the alphabet. Peter the Great went from the Old Slavonic alphabet to the Russian alphabet of 36 letters - and, in 1918, the Russian alphabet was deprived of І, Ѣ, Ѳ and Ѵ.