If you find out, tell me. I've got 200+ acres of corn I'd like to keep them out of. Honestly, with the size of land that you have, it's impossible to keep deer out unless you are willing to dish out thousands upon thousands of dollars to erect deer-proof fencing. The sprays and biological deterrents simply are not practical on that large of a scale.
Effective deer repellents for a property as large as yours would probably be prohibitively expensive. Is there any way you could turn their presence to your advantage. The white-tailed deer is New York's most popular game animal. Could you post the property with signs that read "Deer hunting is permitted on this property with the permission of the owner" Show your phone number and address and charge a reasonable fee to those who apply.