2019
GusevMedyanik - Geometry Didactic Materials 9 class ru
    https://uchitel.by/catalog/book/324
2018
GusevMedyanik - Geometry Didactic Materials 8 class ru
    https://uchitel.by/catalog/book/401
1992
GusevLitvinenkoMordkovich - Elementary Math Praktikum - Geometry ru
    55DBB1BAA28150C3F1A5BDEE2EBC7E7B
    17DF587063B012900023F231CE09C682
    !!!
1980
GusevMaslovaSemenovichCherkasov - Geometry Didactic Materials 6 class ru
    C6DB603DD2C800F87280AF064D3308DD
    ! and for other classes
1973
GusevMaslovaNagibinSemenovichCherkasov - Geometry Didactic Materials 7 class ru
    14DFD424422DD907428B95567A7EC9C1
    2FDCAE86F0EFEEF2DB72A68D44316FDB

---------
2019
Gusev - Geometry Problemsbook 7 class ru
    390663FDE21F46B94D2941D4A2F741BE
2005
Gusev - Geometry Problemsbook 5-9 class ru
    2A4E12F9068728E14D82E61124B5C670
1985
GusevMaslovaSkopets - Geometry Problemsbook 6-8 class ru
    9F29EAFF0F8749C7CFF8E847A37C5CAB
1977
GerasimovaGusevMaslovaSkopetsYagodovskiy - Geometry Problemsbook 9-10 class ru
    EAADF8D1AD2D673F0A7621C3B1F5AB6D