http://www.rssboard.org/rss-specification 720 http://catalog.wrhs.org/collections/search?freeformQuery%3Dgovernment;expand%3Dsubject;f1-subject%3DMine%20surveying. Results for your query: freeformQuery=government;expand=subject;f1-subject=Mine surveying. Tue, 28 Jul 2020 12:00:00 GMT http://catalog.wrhs.org/collections/view?docId=ead/MS4454.xml Butler Aerial Surveys, Inc., was a Cleveland, Ohio, company which conducted aerial surveys throughout Ohio, during the first half of the twentieth century. The collection consists of client accounts and business files, including financial records, flight reports, correspondence, and a photograph index notebook. The collection pertains largely to the operation of an aerial survey company, whose clients included many Ohio coal and mining companies. http://catalog.wrhs.org/collections/view?docId=ead/MS4454.xml Wed, 01 Jan 2014 12:00:00 GMT