PY Publication Year

(a limit field)

1988 in py

py=1988

py=1996-1999

The PY field indicates the year in which the document was published. You can search for an individual year or a range of years. Search using the field label (PY), or select individual years from the Publication Year Field-Specific Index.

In addition to in and =, the following operators may be used with the PY field:

< less than,

such as py<1990

> greater than,

such as py>1991

<= less than or equal to,

such as py<=1989

>= greater than or equal to,

such as py>=1992

- within a range,

such as py=1990-1992