ESearch Entrez Utility
part of the NCBI Eutils tools

Try this:
db   = pubmed (database to search for)
term = words(s) to search, use '+' instead of space
retStart = x  (x= sequential number of the first record retrieved - default=0 which will retrieve the first record)
retMax   = y  (y= number of items retrieved. Maximum allowed 10,000)
A detailed description of the ESearch interface is available at

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Dr Jaime Prilusky,