| Answer | Crossword Clue |
|---|---|
| promptuary | a repository; a reference book of facts |
| promptuaries | PROMPTUARY, a repository; a reference book of facts |
| handbooks | A book giving information such as facts on a particular subject or instructions for operating a machine |
| handbook | A book giving information such as facts on a particular subject or instructions for operating a machine |
| indices | INDEX, a type of reference guide in a book |
| indexal | pertaining to an index (a type of reference guide in a book) |
| index | to provide with an index / a type of reference guide in a book |
| casebooks | A book containing a selection of source materials on a particular subject, esp. one used as a reference work or in teaching |
