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What does Rogers (2008) mention as the major source for variation in the hydration rate of obsidian (volcanic glass)?

(33.33 pt') - question #16

Which type a graph does Tufte (2001) identify as the most universally useful?

(33.33 pt') - question #23

The age at the time of death of certain sh, and thus the seasonality of their consumption by humans, can be inferred from the size distribution of:

(33.33 pt') - question #29