60-odd YEARS of MOSCOW MATHEMATICAL OLYMPIADS Compilation and solutions by G. Galperin and A. Tolpygo

LINK1
http://andrej.fizika.org/ostalo/gimnazija/math/ruske_olimpijade/11a-olym-1.pdf
LINK2
http://andrej.fizika.org/ostalo/gimnazija/math/ruske_olimpijade/12a-olym-2.pdf
ORIGINAL WEBSITE
http://maths-obsession.blogspot.com.br/2013/03/mathematical-books.html