Italics are indicated by _underscores_, and superscript by caret signs, e. g. Oheno^npa, 38^{mm}. Individual letters in square brackets were inverted in the printed text. Distribution of petroglyphs in North America 19 Northeastern rock-carvings 19 Rock-carvings in Pennsylvania 20 in Ohio 21 in West Virginia 22 in the Southern States 22 in Iowa 23 in Minnesota …
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