MEDLARS operating experience: addendum.

This brief note supplements the article which appeared in the BULLETIN in the January 1966 issue (vol. 54, p. 1-10). Data for six additional months of operation are given, representing 192 additional searches. Original personnel costs are confirmed; machine costs are considerably lower than during the earlier period. It is estimated that, under the conditions indicated, the cost of a search per year searched is about $66.00.