Rick Ingersoll An Update to the 1991 – 1993 Surveys: This report is meant to complement and update the original (1991) version and the 1992-93 updates, rather than supersede them. The objective is to point out differences in the observations and conclusions of the previous reports and, as a consequence, important points in those earlier documents will not necessarily be repeated here. It should be noted that although the cover of the original report indicated that the survey had been conducted in January 1992, the survey was actually conducted in the autumn of 1991.
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