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Ways to Narrow Your Answer Set in the CA File

Type of Restriction Index Code Use Example
Language /LA To indicate the language
of the original document
=> S L1 AND ENGLISH/LA
Document Type /DT To restrict answers to books, conference
proceedings, dissertations, journals,
patents,technical reports,
reviews, biographical items, book reviews,
editorials, errata, letters to the editor,
news announcements, product reviews, or
miscellaneous.
=> S L1 AND JOURNAL/DT
=> S L1 NOT PATENT/DT
Publication
Year
/PY To indicate the year the
original document was published.
=> S L1 AND 1993/PY
=> SL1 AND 1990-1991/PY
Reproduced with the permission of CAS, a Division of the American Chemical Society, from "Tips for Searching the CAplus & REGISTRY Files." (CAS9613-0298)