Century Schoolbook L contains ugly shapes of some cyrillic letters. These letters significally differs from letters defined in Soviet Standard GOST 3489.23-71 and from letters in russian books typed with Shkolnaya (Century Schoolbook). Lowercase cyrillic letters is wider than latin ones. Some cyrillic "short" letters (for example, Short I U+0419) contains wrong shaped breve. Cyrillic breve must have another contrast: central part of breve must be thinner than ends. Cyrillic breve ends must be with drops. I wrote (in Russian) post in my blog about this bug: http://shoorick.livejournal.com/990945.html This post contains picture http://www.ljplus.ru/img4/s/h/shoorick/compare_schoolbook.png where we can see differences between several fonts: Shkolnaya by GOST 3489.23-71 (black), Century Schoolbook L (brown), Schoolbook of unknown author (maroon) and Century by Agfa Monotype Corporation (blue, only regular, without bold and italic). I think better way is correct cyrillic letters according with GOST 3489.23-71 (official documents (national standards too) in Russia are not copyrighted).
Created attachment 5638 [details] Comparison of Schoolbook fonts Black letters — from GOST, brown — Century Schoolbook L, maroon — Schoolbook of unknown author, blue — Century of Agfa Monotype Corp.
Created attachment 5639 [details] GOST 3489.23-71 Printing Types. Type Family "Shkoljnaya" (for alphabets of Russian and Roman graphic bases). Range of application. Design. Base line. Characters per 4 picas.
I can fix some letters (if it possible with FontForge) and send fixed files to you or commit changes (if I'll get permissions for commit).
Please attach modified fonts to the bug report. Roman part of the font was created by URW, Cyrillic glyphs were later added by Valek Filippov . I also suspect that some of Cyrillic characters have wrong metrics. It would be great if you can check this.
Created attachment 5677 [details] Regular font with several fixes Regular (Roman) font where some cyrillic letters was fixed; at least uppercase: De, Zhe, I short, Ka; lowercase: be, de, zhe, i short, ka, ya. Added upper- and lowercase Yat.
Created attachment 5678 [details] Scanned few lines of text in Russian from book published in 1986 I scan a few pages with Russian letters from old book: Федерико Гарсиа Лорка. Избранное (Federico García Lorca. Selected works) published in Moscow in 1986. Letters from this book appears heavier than in GOST and in Century Schoolbook L.
After much deliberation, we concluded that the cyrillic glyphs were not of suitable quality for printing purposes. We have reverted to the "basic" fonts as URW+ release them, as a result.