Surface drill rigs United States, Mifflinburg, Pennsylvania
Surface drill rigs 1991 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1993 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1990 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1969 United States, Mifflinburg, Pennsylvania
Surface drill rigs 2000 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1989 United States, Mifflinburg, Pennsylvania