Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
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Publications
Shutterstock.com (see reuse policy).
Multiple taxonomy terms match this reference; "R. SPENCER (326816)", "R. SPENCER (394351)". Specify the one you want by appending the id in parentheses, like "R. Spencer (394351)".