These are a collection of some 300 books from Isaiah Berlin's personal collection. The Bodleian Libraries also have the Isaiah Berlin Archive
Razluka : kniga stikhov T͡Svetaeva, Marina, 1892-1941. 1922 | Moskva ; Berlin : Kn-vo "Gelikon" | 37 p. ; 17 cm. | book BERLIN PAMPH.50