Mysteries of the Unknown

144 pages hardcover 1989

nonfiction reference informative slow-paced

144 pages hardcover 1990

nonfiction dark informative fast-paced

160 pages hardcover 1987

nonfiction reference dark informative slow-paced

missing page info 1987

nonfiction informative medium-paced

160 pages hardcover 1987

nonfiction history reference informative medium-paced

144 pages hardcover 1988

nonfiction horror mysterious medium-paced

160 pages 1990

nonfiction history informative medium-paced

144 pages hardcover 1988

nonfiction science adventurous informative mysterious slow-paced

144 pages 1991

nonfiction reference informative slow-paced

144 pages 1993

nonfiction challenging informative inspiring medium-paced