Perhaps you should try some spelling variations:
york volunteer » form volunteer, worker volunteer, mock volunteers
89th regiment » 11th regiment, 40th regiment, 58th regiment
its regiment » his regiment, 9th regiment, das regiment
ist regiment » first regiment, 71st regiment, his regiment

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: 7th new york volunteer ((((its regiment) OR (ist regiment))) OR (89th regiment)).
• Adding a wildcard symbol may retrieve word variants: 7th new york volunteer ((((its regiment) or (ist regiment))) or (89th regiment))*.