The astronomer A.E. Douglass is generally recognized as the founding father of dendrochronology. He studied tree rings in the search for evidence that solar variation (as seen in sunspots) is reflected in climate variation. He was convinced that his quest was successful. Analysis of some of his early data using Fourier decomposition and comparison of tree-ring periodograms with those based on known solar cycles suggests that the cycles he found may not exist or may not be of pure solar origin. The findings here reported suggest a much stronger influence of tides on the tree-ring records than commonly considered. Douglass’s great merit as the pioneer of tree-ring dating in archeology and tree ring- based climatology remains unaffected by the findings here presented.

In the following are listed the various references used in a treatise on ocean exploration, recently published by the University of California Press (Berger, W.H., 2009. Ocean – Reflections on a Century of Exploration. UC Press, Berkeley 519pp.; with contributions by E.N. Shor). The list is alphabetical (unlike in the volume) and is suited for electronic searching and for downloading. The references were assembled to reflect ocean research in the 20th century. There is some bias toward marine geology and ecology, and toward work in these fields at the U.S. West Coast. Also, there is some emphasis on research at Scripps Institution of Oceanography (which celebrated the centennial of its founding in 2003). Historical aspects owe much to numerous contributions by E.N. Shor. For topics that were not represented in my collection of reprints and books, I used various symposia and encyclopedias. One that proved especially useful is the 6-volume encyclopedia on the ocean edited by Steele et al. (2001). Some relevant references only list the name of the contributor and the treatise. A few references are incomplete in the original book and have been completed for the present list. The total number of references is 889.