Nearly a half century has passed since the American Geological Institute (AGI) published its well-known “Data Sheets”. Just out of university in 1965, I purchased the first edition (53 pages for $5; $34 in today’s money). I opted to pay an extra dollar for the deluxe version: to have the sheets in a convenient small (12 × 18 cm) 6-ring loose-leaf binder. I carried the sheets (or selections from them) in my pack during decades of mapping in the Andes. The sheets were handy, but the paper was thin and of poor quality. I repaired sheets that tore out with...

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