TY - RPRT TI - The viscosity of synthetic and natural silicate melts and glasses at high temperatures and 1 bar (105 pascals) pressure and at higher pressures AU - Michael P. Ryan AU - James Y. Blevins PY - 1987 DO - 10.3133/b1764 UR - https://pubs.usgs.gov/publication/b1764 ID - b1764 ER -