The term contracts as used in this Subpart shall include contracts for surveys, test borings, architectural and engineering services, material-testing and demolition, as well as the group of construction contracts included in the 1460, Structures, Equipment, and Improvements, group of development of cost accounts. Contracts for the purchase of land, appraiser's or negotiator's services, etc., are described separately and are to be distinguished from the contracts included in the scope of this paragraph. The instructions and procedures with respect to the contracts included in the scope of this Subpart are limited to the accounting features only.