The book was also used for a cross-index to the names of individual correspondents.
I had a leather document case stuffed with papers and a cross-index of 'em in my so-called brain.
A most satisfactory plan is to file one copy numerically and one alphabetically, making a cross-index.
A very satisfactory form of card for this cross-index is shown in Fig. 2, which also shows the manner of filing.
To locate his folder, a cross-index is necessary, as it is not possible to remember the numbers of all correspondents.
This would be exactly like the cross-index shown in Fig. 16, except that the number would be omitted.
“About how to cross-index our follow-up letter catalogue better,” he answered promptly.