Surface drill rigs 1989 United States, Mifflinburg, Pennsylvania
Surface drill rigs United States, Mifflinburg, Pennsylvania
Surface drill rigs 1978 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1986 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1980 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1990 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1991 United States, Mifflinburg, Pennsylvania