Lawrence County Pennsylvania Atlas, 1872 - usgwarchives.net
Pollock township was formed May 28, 1858, from parts of Neshannock and Shenango townships. Upon the erection of New Castle into a city, February 25, 1869, this township was included within the city limits, and now constitutes the third and fourth wards.
Pennsylvania Early County Maps and Atlases - Sites at Penn State
Information was gathered from several checklists (see below) along with historical county information, to create an authoritative listing of early Pennsylvania maps and atlases. Many atlases have not been scanned yet.
Historic Land Ownership Maps & Atlases Online - ThoughtCo
This collection of township plat maps from the Public Lands Survey includes maps for all or parts of Alabama, Illinois, Indiana, Iowa, Kansas, Mississippi, Missouri, Ohio, Oklahoma, Oregon, Washington, and Wisconsin.
Lawrence County - Ancestor Tracks
Lawrence Co. was created in 1849 from parts of Beaver and Mercer Counties. Beaver had been created in 1800 from Allegheny and Washington Counties; Mercer was created from Allegheny County in 1800. Thus, all of these counties should be checked for warrants, deeds and wills, etc.
PA State Archives - RG-47 - Series Titles - Microfilm: County Governments
ALLEGHENY COUNTY Created on September 24, 1788, from parts of Westmoreland and Washington counties. The county seat is Pittsburgh.
History of Cranbury
On March 7, 1872, Cranbury Township was officially created and organized as a separate political subdivision of Middlesex County, consisting of the village of Cranbury and outlying areas, which were then parts of South Brunswick and Monroe Townships.
Formation of Greenwood Township - Crawford County
Boundaries: Beginning at the S. W. corner of [Vernon Twp.], being the N. W. corner of a tract in the name of Jno.
Clark County Missouri MOGenWeb Project Township Map Page
But a strip of land, a few miles in with lying north of this line being then claimed by both the State of Missouri and Iowa Territory, the county court created a new township comprising all of this disputed strip of land lying north of said Indian boundary line which is now the state line.