@misc{indiciae41b201c21585,
  title = {Major and trace elements in igneous rocks from Apollo 15.},
  author = {Helmke, P. A. and Blanchard, D. P. and Haskin, L. A. and Telander, K. and Weiss, C. and Jacobs, J. W.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730058963},
  note = {Source identifier: 19730058963}
}