The abstract mentioned in the two preceding rules shall state:
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(a) The nature of each document or written instrument intended to be used as evidence and its date; or
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(b) If a contract or conveyance, its date, the parties thereto and the date of the proof of acknowledgment, and before what officer the same was made; and
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(c) Where recorded, stating the book and page of the record.
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(d) If not recorded in the county when the trial is had, copies of such instrument, with the names of the subscribing witnesses, shall be included. If such unrecorded instrument be lost or destroyed it shall be sufficient to state the nature of such instrument and its loss or destruction.