Pennsylvania Session Law are available for free online from the Pennsylvania General Assembly (begins with 1969). Select older years may be available from the Pennsylvania Legislative Reference Bureau. See below for more details.
Bills and Amendments Pennsylvania General Assembly
Full text of the final version of House and Senate Bills. 1969 - present. Only bill text and short title are available for sessions prior to 1969.
Pennsylvania Legislative Reference Bureau
See Pamphlet Laws (select coverage beginning with 1802), Smith's Laws (1700 - 1802), and Statutes at Large (1682 - 1809).