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Nikon D3100 Review
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Amazon.com: 32GB SD Card Class 10 High Speed Memory Card Compatible with Nikon D3100, D3300, D3400, D5100, D5300, D5500, D5600, D7100, D7200, D7500, D610, D750, D810, D850, D810A Camera | UHS-1 U1
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Memory card insert/remove on Nikon D3100 DSLR - YouTube