Mathematical miniatures Svetoslav Savchev, Titu Andreescu.

by Savchev, Svetoslav.
Published 2003

U.S.A. Mathematical Olympiads, 1972-1986 compiled and with solutions by Murray S. Klamkin.

by Klamkin, Murray S.
Published 1988

International Mathematical Olympiads 1978-1985 and forty supplementary problems / compiled and with solutions by Murray S. Klamkin.

by Klamkin, Murray S.
Published 1986

International Mathematical Olympiads 1959-1977 compiled and with solutions by Samuel L. Greitzer.

by Klamkin, Murray S.
Published 1978

Hungarian problem book II based on the Eotvos Competition, 1929-1943 / compiled by G. Hajos, G. Neukomm, and J. Suranyi ; translated by Elvira Rapaport.

by Hajós, György.
Published 1963

Hungarian problem book I based on the Eotvos Competitions, 1894-1905 / revised and edited by G. Hajos, G. Neukomm, J. Suranyi; translated by Elvira Rapaport.

Published 1963

Hungarian problem book III based on the Eotvos Competition, 1929-1943 / compiled by G. Hajos, G. Neukomm, and J. Suranyi ; translated and edited by Andy Liu.

by Hajós, György.
Published 2001

Aha! Solutions Martin Erickson.

by Erickson, Martin J., 1963-
Published 2009

Sink or float? thought problems in math and physics / Keith Kendig.

by Kendig, Keith, 1938-
Published 2008

Rediscovering mathematics you do the math / Shai Simonson.

by Simonson, Shai.
Published 2011