Mysteries of the Unknown

144 pages first pub 1989 (editions)

nonfiction history dark informative mysterious medium-paced

160 pages first pub 1987 (editions)

nonfiction science informative mysterious slow-paced

176 pages first pub 1989 (editions)

nonfiction history informative slow-paced

144 pages first pub 1995 (editions)

nonfiction informative inspiring tense medium-paced

144 pages first pub 1992 (editions)

nonfiction challenging informative slow-paced

160 pages first pub 1990 (editions)

nonfiction adventurous reflective slow-paced

144 pages first pub 1991 (editions)

nonfiction challenging informative slow-paced

160 pages first pub 1988 (editions)

nonfiction reference science informative medium-paced

160 pages first pub 1989 (editions)

nonfiction mysterious slow-paced

144 pages first pub 1992 (editions)

nonfiction informative inspiring tense medium-paced