Douglas Huebler: November 1968 includes images of annotated maps, diagrams, photographs and drawings, each proposing a piece of work by Huebler. Many of the works are labeled as ‘site sculpture project’, and include the exchange of postal receipts across fourteen locations labeled A to N, which lie along the 42º parallel of the United States, and melting snow using aluminum crosses and underground heat tape.

“The existence of each each sculpture is documented by its documentation. The documentation takes the form of photographs, maps, drawings and descriptive language. The marker ‘material’ and the shape described by the location of the markers have no special significance, other than to demark the limits of the piece. The permanence and destiny of the markers have no special significance. The duration pieces exist only in the documentation of the marker’s destiny within a selected period of time. The proposed projects do not differ from the other pieces as ideas, but do differ to the extent of their material substance.“ - from introduction by Douglas Huebler.