Maybe I´m just repeating some information but here are some Froms Gambit sources from my german point of view:
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Gambit 59 by Stefan Bücker (~60pages?, german language, Nürnberg 1984) was a kind of early german SOS . The titel is about 1.g3 d5 2.Bg2 e5 3.b4 [Larsen-Olafsson,Hoogovens 1959, compare chesscafe.com "Over the horizons" (feb+mar+apr08)], other chapters are about 2.c4 d5 3.cxd5 exd5 4.Qb3 against the French, 3.exf5 e4 4.Ng1 against the Latvian, 3.Bg5 Bxe4 4.d5 against the Owen, Caro-Kann Phantasy, etc.
One chapter is about the Neo-From concentrating on 2...Nc6 3.Nf3 g5 4.d4 g4 5.Ng5 d6 6.exd6 Qxd6.
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Bird´s Opening A02 by Viktor Ivanov (39pages, informator-style, Russian Chess House 2003) , deals with 1...f5, 1...b5, 1...g6, 1...c5, 1...Nf6 and mainly (22p.) with the From. Contains some not-well-known games from Russia. Thin but cheap (€5), obviously still on-stock at
www.niggemann.com.
- I don´t know if the first edition (88pages,1963) of
Froms Gambit by Dr.Georg Deppe has different analysis than the second one (109pages, 1979), but a search for "froms" at
www.zvab.com leads to offers of both editions.
- Regarding Christoph63´s suggestion of
Bird-Eröffnung 1.f2-f4 by Rolf Schwarz (156pages, 1960/reprinted 1996) I would like to stress that ~30% of the book is about 1...e5.
- Dragonslayer mentioned
Das Froms-Gambit by Helmut Warzecha. There's not much original analysis, but it´s a good compilation of most earlier sources, a helpful overview.
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Das Schacharchiv (published) by Kurt Rattmann was maybe the most important german-language opening source in the 1980s, delivered monthly(?) in loose-leaf edition. Some of the last editions (~1988?) were bound into soft-cover books with ~200pages and one of these (no. 46?, 47? 48?) had a ~50page analysis by Lev Gutman on the Froms, concentrating on 2...d6 3.exd6 Bf5?! It´s Gutman-style, comparable with his book on the Fajarowicz... - Maybe I´ll succeed to get more detailed information about this.
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Regarding the Neo-From or Schlechter Variation 2...Nc6 it´s certainly interesting to look at 1.f4 Nc6!?, my personal favourite.
+ it avoids 1.f4 e5 2.fxe5 Nc6 3.Nc3, instead 1.f4 Nc6 2.Nc3 d5 3.d4 Bg4 is just positional chaos
+ if White plays 1.f4 Nc6 2.Nf3 in a too self-confident way, Black can still sidestep the From with 2...d5 or 2...Nf6
+ after 1.f4 Nc6 White might play other/inferior moves than 2.Nf3: 2.e4 d5!, 2.g3/e3/b3 e5!, 2.d4 e5! (3.d5 exf4!!, 3.dxe5 f6, 3.e3 exf4 4.exf4 d5)
- Black must accept to play a Nc6 defence against the King´s Gambit after 1.f4 Nc6 2.Nf3 e5 3.e4. Now 3...exf4, 3...Bc5, 3...f5 are all sharp, less explored, less known and at least "playable".
tracke