PY Publication Year

(a limit field)

1985 in py

py=1985

The PY field indicates the year in which the original document was published.

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