| Enclosure returned by the P.O. | 30 |
| Encl. with an autograph request | 31 |
| Enc. with a manuscript | 22 |
| Enc. for response | 17 |
| Ed.'s request, often | 24 |
| Correspondence courtesy: Abbr. | 30 |
| Contest entry enclosure: abbr. | 30 |
| Writer's Market abbr. | 25 |
| Wedding invitation courtesy, briefly | 36 |
| Utility encl. | 13 |
| Submission addition: Abbr. | 26 |
| Snail-mail enc. | 15 |
| RSVP enclosure, often | 21 |
| RSVP courtesy | 13 |
| RSVP card enclosure | 19 |
| RSVP card accompanier | 21 |
| Returned MS holder | 18 |
| Return-mail enc. | 16 |
| Return-mail acronym | 19 |
| Return mailer: Abbr. | 20 |
| Return mailer, for short | 24 |
| Requirement for MS. return | 26 |
| Reply requirement: abbr. | 24 |
| Reply req. | 10 |
| Reply courtesy, briefly | 23 |
| Ready-to-mail item: Abbr. | 25 |
| Ready-to-mail item, briefly | 27 |
| Query encl. | 11 |
| Prepaid encl. | 13 |
| Postpaid enclosure: Abbr. | 25 |
| Postage-paid enclosure: Abbr. | 29 |
| Postage-paid encl. | 18 |
| Postage-paid enc. | 17 |
| Part of an author's submission: Abbr. | 41 |
| Oft-required enc. | 17 |
| MS. inclusion | 13 |
| MS. enc. | 8 |
| MS attachment | 13 |
| MS accompaniment | 16 |
| MS accompanier | 14 |
| Mailing courtesy, briefly | 25 |
| Mailed encl. | 12 |
| Mail-enclosure courtesy: Abbr. | 30 |
| Ltr. encl. | 10 |
| Junk mail encl., sometimes | 26 |
| Item with a MS. | 15 |
| Item in a slush pile, for short | 31 |
| It's sent to an ed. | 23 |
| It should come back to you after a while: Abbr. | 47 |
| It may be used for many unhappy returns: Abbr. | 46 |
| It may accompany a MS. | 22 |
| It has your name on it: Abbr. | 29 |
| International Reply Coupon rel. | 31 |
| Inclusion with a manuscript (Abbr.) | 35 |
| Frequent encl. | 14 |
| Freq. enclosure | 15 |
| Freelancer's encl. (m) | 26 |
| Epistolary courtesy | 19 |
| Encl. with an RSVP | 18 |
| Encl. with an autograph request letter | 38 |
| Encl. with a sweepstakes entry | 30 |
| Encl. to facilitate a response | 30 |
| Enc. with a bill | 16 |
| Enc. to an editor | 17 |
| Enc. for a response | 19 |
| Enc. accompanying an autograph request | 38 |
| Ed.'s convenience | 21 |
| Cover letter accompaniment (abbr.) | 34 |
| Courteous enclosure: abbr. | 26 |
| Correspondent's encl. | 25 |
| Correspondence enc. notation | 28 |
| Correspondence courtesy, for short | 34 |
| Correspondence courtesy, briefly | 32 |
| Correspondence courtesy inits. | 30 |
| Convenience for an ed. | 22 |
| Certain encl. | 13 |
| Business-reply encl. | 20 |
| Autograph collecting aid, for short | 35 |
| Author's encl. | 18 |
| Aid in answering: Abbr. | 23 |
| Accompaniment for a submission to an ed. | 40 |
| A MS. might come back in it | 27 |
| MS. enclosures | 14 |
| Return-mail encs. | 17 |
| Ppd. enclosures | 15 |
| Postpaid encls. | 15 |
| Letter encls. | 13 |
| Freelance writers' encls. | 29 |
| Encls. to editors | 17 |
| Submission encs. | 16 |
| Freelancer's encls. | 23 |
| Enclosures with MSS. | 20 |
| They're enclosed for returns: abbr. | 39 |
| They may go with unsolicited manuscripts: Abbr. | 47 |
| Submitters' encls. | 22 |
| Submitter's encls. | 22 |
| Some encs. | 10 |
| Return mail courtesies (Abbr.) | 30 |
| MS. accompaniers | 16 |
| Invitation enclosures (Abbr.) | 29 |