@misc{indiciae6aa36b54415b,
  title = {A topographic base for GIS from automated TINs and image-processed DEMs},
  author = {Richard J. Pike and Gail P. Thelin and William Acevedo},
  year = {1987},
  url = {https://pubs.usgs.gov/publication/70093567},
  note = {Source identifier: 70093567}
}