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524 Studies found for: standard AND United States | ( Map: Mexico )

Terms and Synonyms Searched:

Terms Search Results* Entire Database**
Synonyms
standard 524 studies 75,156 studies
United States 524 studies 156,038 studies
U.S. 17 studies 3,759 studies
U S -- 9 studies
States 520 studies 175,267 studies
Territory 34 studies 1,375 studies
stated 5 studies 1,222 studies
United 519 studies 170,968 studies

   
-- No studies found
* Number of studies in the search results containing the term or synonym
** Number of studies in the entire database containing the term or synonym