Thomas W. Caless; The Universal Decimal Classification (UDC) Applied to the International Seismology Literature at VESIAC. Seismological Research Letters ; 36 (3-4): 37–38. doi: https://doi.org/10.1785/gssrl.36.3-4.37
An effort is being made by the VELA Seismic Information Analysis Center (VESIAC) to organize and index the international seismology literature in accordance with the Universal Decimal Classification (UDC) system. Complete revision of UDC 550.34 Seismology schedules is underway with the assistante of a special committee formed by VESIAC. In addition, VESIAC is developing a computer retrieval technique designed to provide requestors with a comprehensive deep search of the indexed literature.