Table 2. GeoRef database statistics. Search results as of 20 Nov 1995. A, number of indexed items (that is, indexed under Geology) that were published in each year; B, number indexed under paleobotany or palynology; C, number indexed under palynology only.

 

        A     B    C    %    %
year   geol  p+p  ply  B/A  C/B
-------------------------------
1995   6050   57   10 0.94 17.5

1994  27022  220   56 0.81 25.5
1993  42923  400   55 0.93 13.8
1992  49232  696   61 1.41  8.8
1991  56920  811   58 1.42  7.2
1990  65490  790  109 1.21 13.8

1989  64519  866   95 1.34 11.0
1988  68946  917  113 1.33 12.3
1987  70811 1002  103 1.42 10.3
1986  67855 1107  118 1.63 10.7
1985  66428  942  103 1.42 10.9

1984  69631 1092   88 1.57  8.1
1983  64419  937   67 1.45  7.2
1982  71346 1068   73 1.50  6.8
1981  71390 1158   66 1.62  5.7
1980  66426 1166  126 1.76 10.8

1979  63766 1122   95 1.76  8.5
1978  60287 1211  124 2.01 10.2
1977  49554 1126   75 2.27  6.7
1976  47382  991   55 2.09  5.5
1975  48360  954   54 1.97  5.7

1974  48562 1148   81 2.36  7.1
1973  47368 1101   69 2.32  6.3
1972  44808 1050   84 2.34  8.0
1971  44030 1081   64 2.45  5.9
1970  46757  961  111 2.06 11.6

1969  45358 1002  143 2.21 14.3
1968  39900  931  150 2.33 16.1
1967  33795 1162  166 3.44 14.3
1966  24478 1242   68 5.07  5.5
1965  18505  646  154 3.49 23.8

1964  16404  581  209 3.54 36.0
1963  15695  397  155 2.53 39.0
1962  13864  436  232 3.14 53.2
1961  12055  403  151 3.34 37.5
1960  14054  437  147 3.11 33.6

1959  10670  275   69 2.58 25.1
1958  10836  303   76 2.80 25.1
1957  10429  268   27 2.57 10.1
1956  10719  256   13 2.39  5.1
1955   9992  240   12 2.40  5.0

1945+ 72162 1971   26 2.73  1.3
1935+ 65486 2150    1 3.28  0.0
1925+ 29391  893    0 3.04  0.0
1915+ 12650  265    0 2.09  0.0
1905+ 13615  271    0 1.99  0.0

<1905 28417  681    0 2.40  0.0

All disks in the GeoRef CD ROM set were searched back into the previous century, to ensure that all indexed items were included in the counts. This was necessary because (for example) the disk for 1988 through September 1995 included 3920 items published in 1975. It appears that GeoRef now indexes roughly 80% of the published items for a given year within 3 years, and indexes 90% within 10 years.