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Appendix I Frog, where are you?
1 Pictures reproduced from Mayer (1969), with permission of the author/artist and publisher. Original format: ...
1 Pictures reproduced from Mayer (1969), with permission of the author/artist and publisher. Original format: 25 cm x 14.5 cm, sepia-tone, one single panel or one-half double panel per page, no text; page numbers added.