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Card 6

Front

In what year did Sugarman make his discovery?

Back

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Card 7

Front

What did Becker do?

Back

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Card 8

Front

What did Becker's study involve?

Back

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Card 9

Front

In what year did Becker make his discovery?

Back

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Card 10

Front

What did Gillbourn and Youdell do?

Back

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Card 11

Front

What did they find out from their study?

Back

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Card 12

Front

What else did Gillbourn and Youdell link this discovery to?

Back

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Card 13

Front

In what year did Gillbourn and Youdell make their discovery?

Back

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Card 14

Front

What did Feinsten find out?

Back

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Card 15

Front

In what year did Feinsten make his discovery?

Back

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