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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

Why were Leucci and Negri (2006) unable to conhrm the presence of ipogei (tombs) in Area A of their survey by ground penetrating radar (GPR) in the historical center of Mesagne (Italy)?

(33.33 pt') - question #11

What issue with chloropleth maps does Monmonier (1990) identify?

(33.33 pt') - question #24