A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
J. P. Bradbury, B. Leyden, M. Salgado-Labouriau, W. M. Lewis, C. Schubert, M. W. Binford, D. G. Frey, D. R. Whitehead, F. H. Weibezahn. "Late Quaternary Environmental History of Lake Valencia, Venezuela." Science 214.4527 (1981) 1299-1305