Cover Art Check

There are some questions regarding the cover artists for these pulp covers. What are your thoughts?

Modest Stein

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There are a few covers above not previously attributed to Stein.

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Unknown Artist 1

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Unknown Artist 2

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(Note: Mar-Apr 1948 has been attributed in the past to Edd Cartier.)

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Unknown Artist 3 – Charles Ravel?

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Do you agree/disagree with these groupings?