The World Book Encyclopedia: A Volume 1
Nault, William H., Zeleny, Robert O., Harmet, Richard A., Janus, Robert J., idr
World Book, Inc. · 1990
The World Book Encyclopedia: B Volume 2
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: C-Ch Volume 3
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: Ci-Cz Volume 4
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: D Volume 5
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: E Volume 6
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: F Volume 7
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: I Volume 10
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: L Volume 12
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: L Volume 13
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
The World Book Encyclopedia: Research Guide/Index Volume 22
idr, Zeleny, Robert O., Harmet, Richard A., Janus, Robert J.
World Book, Inc. · 1990
