[1] Precision Depth Recorder (->"IEEE Standard Dictionary")

[2] Priority Data Reduction (->"IEEE Standard Dictionary")

[3] Processing Data Rate (->"IEEE Standard Dictionary")

[4] Public Document Room (->"IEEE Standard Dictionary")

[5] Preliminary Data Requirements (->"NASA Acronym List")

[6] Preliminary Design Review (->"NASA Acronym List")

[7] Program Design Review (->"NASA Acronym List")

[8] Processed Data Recorder (->"NASA Acronym List")