The 1991 World Book year book. : The annual supplement to The World Book encyclopedia. A review of the events of 1990.

The 1989 World Book year book. : The annual supplement to The World Book encyclopedia. A review of the events of 1988.

The 1993 World Book year book. : The annual supplement to The World Book encyclopedia. A review of the events of 1992.

The 1996 World Book year book. : The annual supplement to The World Book encyclopedia. A review of the events of 1995.

The 1994 World Book year book. : The annual supplement to The World Book encyclopedia.

The 1993 World Book. Year Book. : The annual supplement to the World Book encyclopedia. /

World topics year book 1993. : A review of the events of 1992. /

The 1990 World Book year book. The annual supplement to The World Book

The 1989 World Book year book. The annual supplement to The World Book

The World Book health and medical annual 1990.

The World Book encyclopedia. Volume 12., L.

The World Book encyclopedia. Volume 1., A.

Science year 1990. : The World Book annual science supplement. A review of science and technology during the 1989 school year.

Britannica book of the year 1996.

Science year 1990. The World Book annual science supplement. A review of

The World Book encyclopedia. : Volume 1. A.

The World Book encyclopedia of science. Volume 6., The animal world.

The World Book health and medical annual 1994.

The World Book health and medical annual 1995.

The World Book health and medical annual 1996.