Scott Andrew Trexler II Research Library and Archives

Over 12,000 Volumes & Three Million+ Documents

Research Library Closing for Air Conditioning Updates

Due to technology upgrades to our air conditioning HVAC systems in the Research Library, the system will not be operational during the week of Monday, August 15th through Friday, August 19th. These upgrades will ultimately make our climate-controlled system more reliable and energy efficient.

With this long anticipated repair work scheduled, we must close the Research Library for the days this work is being conducted. If the upgrade takes longer than anticipated, and we must remained closed longer, we will post the change on our website. Please check our website or call 610-435-1074 to ensure that the Research Library is open for visitation. We apologize for any inconvenience.


Jill Youngken

Director of Library/Archives

Assistant Director

UPDATE: The Research Library is open for visitation on Tuesday, Wednesday, and Thursday from 10:00 am to 4:00 pm.  Friday hours are by appointment only. Please call 610-435-1074 between 9:30 am and 5:00 pm to schedule a Friday Library visit. Face Masks are required while in the Research Library and social distancing is maintained.

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Welcome to the Lehigh County Historical Society’s Research Library and Archives. Here, at one of Pennsylvania’s most significant archives, there is a wealth of resource material for the serious and casual historian and the genealogist: books, maps, newspapers, photographs, oral histories, church and social records, personal and family papers, business documents and numerous county records.

For those who cannot travel to the Research Library, we offer researchers our convenient Research Request Look-up Service. A “look-up” is defined as looking up information about one named person, topic or document in a specific collection or record group. For more information and to request a look-up, please complete our

The General Harry C. Trexler Collection Finding Aid provides an overview of our collection of materials related to General Harry C. Trexler (April 17, 1854-November 17, 1933).  Born in Easton, Pennsylvania, he was an American industrialist, conservationist, and major philanthropist.  In 1885, Trexler married Mary M. Mosser.  They were married for 48 years, until his death in 1933 from injuries suffered in an automobile accident.  Mary died one year later.  They had no children.  Through a charitable trust Trexler established in his Will, his wealth continues to provide a major benefit to the people and community of Lehigh County, Pennsylvania. 

Our collection of Trexler materials described in the Finding Aid includes ledgers, land records, maps, scrapbooks, photographs, and ephemera related to Trexler’s life and the legacy he left behind.  Our Finding Aid is designed to guide “in-house” research.  This collection is not digitized for off-site viewing or research.  Questions should be directed to Jill Youngken, Director of the archives at 610-435-1074 or 

Thank you for your interest in the life of General Harry C. Trexler.