I recently came across this 1929 Comprehensive Plan for the City of Lancaster on their website. It includes data analysis and policies that guided the City’s development in the ’20s, ’30s, and ’40s. It also contains several impressive maps.
The Lancaster City Planning ReportLancaster-Pennsylvania-1929-Reporting-to-City-Planning-Commision-3
If your browser is struggling with the embedded PDF viewer, click here for a downloadable version of the report.