Indiana Code Title 6. Taxation § 6-1.1-6-18

Sec. 18. (a) Except as provided in subsection (b), the owner of a parcel of land which is classified as native forest land, a forest plantation, or wildlands shall post four (4) signs on the parcel.  The owner shall place the signs on the boundaries of, and on different sides of, the parcel at the points which are the most conspicuous to the public or at the property corners.  The department of natural resources shall furnish the signs and shall designate the size and the wording of the signs.

(b) The owner of a parcel of land which:

shall post two (2) signs on the parcel.  The owner shall place the signs on different sides of the parcel at the points which are the most conspicuous to the public or at the property corners.  The department of natural resources shall furnish the signs and shall designate the size and the wording of the signs.