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1984 • 1 Reader
1987 • 186 pages
2002 • 2 Readers
2011 • 5 Readers • 29 pages • 3.5
2010 • 2 Readers • 301 pages • 5
2017 • 560 pages
1998 • 2 Readers • 232 pages • 4
2009 • 1 Reader
2019 • 1 Reader • 332 pages
2004 • 798 Readers • 529 pages • 3.9
2019 • 1 Reader • 104 pages
#1 of 3 in The Mysteries of Nature Series