Baltimore County, Maryland, Marriage Licenses, February 11, 1815 - April 30, 1823 Ports Michael A. Heftet / 2013 / Engelsk
Baltimore County, Maryland Marriage Licenses, May 1, 1798 to February 11, 1815 Ports Michael A. Heftet / 2013 / Engelsk
Baltimore County, Maryland Trader and Ordinary Licenses, 1830-1831 Ports Michael A. Heftet / 2013 / Engelsk
Hydraulic Engineering Proceedings of the 1989 National Conference on Hydraulic Engineering Ports Michael A. Heftet / 1989 / Engelsk
Low Impact Development Technology Design Methods and Case Studies Clar Michael L. Heftet / 2015 / Engelsk
Low Impact Development Technology Implementation and Economics Clar Michael L. Heftet / 2015 / Engelsk
