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Use quotation marks for phrase searching, e.g., "national parks"
COMPUTER = computer, Computer, and COMPUTER
super? = super, superconductor, superintendent, superpower, supervisory, etc.
?ment = amendment, department, supplement, etc.
wom?n = women and woman
In non-phrase searches there is an implied AND between search terms
Boolean operators AND, OR, and NOT may be used between search segments
"national parks" AND recreation
NAS 1.21? = finds records with SuDoc number beginning with or containing NAS 1.21