13421
by SPITERI
Published 1990
13422
Published 1980
13423
by WRIGHT
Published 1986
13424
by Luyben
Published 1990
13425
by THOMPSON
Published 1989
13426
13427
Published 1996
13428
by Neamen
Published 1996
13429
by Pany
Published 1997
13430
by Post
Published 1997
13431
by SCHACH
Published 1997
13432
by STODDARD
Published 1998
13433
by Samuelson
Published 1998
13434
by Yeo Miow Cheng
Published 2007
13435
by SCHACH
Published 1996
13436
by SEVENAIR
Published 1997
13437
by Blank
Published 1998
13438
Published 1998
13439
by SUDMAN
Published 1998
13440