Limit Fields

Limit fields, when combined with other search terms, are particularly useful for focusing or limiting a search. To search a limit field, use the in or = operators with the field abbreviation, such as 1990 in py or py=1990. Omitting the field label retrieves information from free text (non-limit) fields only.

For limit fields containing numeric data, you can also use other special operators:

= equal to py=1995

< less than py<1990

> greater than py>1986

<= less than or equal to py<=1986

>= greater than or equal to py>=1986

- indicates a range py=1994-1995