These have all been compiled so that each lecture is one audio file. Information on the tapes from which these came follows:

The Book of Mormon Seminar

All but three tapes are live recordings from a seminar given in Snowflake Arizona, August 10, 11, 12 - 1989.

Tapes 1, 2 and 17 were added by Hyrum at a later date to supplement the set.

tape 1 - A new dispensation opens (43:05)
tape 2 - missing.
tape 3 - The meaning of Gethsemane (1:27:29)
Tape 4 - The meaning of Calvary (1:17:53)
tape 5 - The 13 looks of Nephi, Christ's redemption from the fall
HA's wife, Helen Mae is the speaker for the first 1:04:45 of tape5. (1:23:27 total)
HA then does a section, finishing up the session with thoughts on the redemptive earth and the question of One God.

tape 6 - Divine justice and mercy (1:28:19)
tape 7 - Nephi's last days prophecies - part 1(1:27:21)
tape 8 - part 2 (1:25:32)
tape 9 - Becoming sons and daughters of Christ (1:26:54)
tape 10 - The new life in Christ (1:20:46)
tape 11 - Justification and sanctification (1:24:52)
tape 12 - Enduring to the end (1:25:27)
Helen Mae is the speaker for 16:40

tape 13 - Nephi, key to Isaiah - part 1 (1:26:18)
tape 14 - part (1:25:00)
tape 15 - The Holy Order (1:16:33)
this tape should be of interest to every endowed member.
ETB - What I hope you teach your children about the Temple

tape 16 - The law of Zion (1:27:25)
tape 17 - Consecration and stewardship(0:15:34)
tape 18 - Zion and Israel (1:31:26)
tape 19 - Christ's coming to Zion, Jews, World (1:03:21)
tape 20 - Nephi's and John's Revelations of the last days - part 1 (1:20:19)
tape 21 - part 2 (1:25:58)

All tapes had a narrator interrupt the talk one half of the way through and tell you to flip the tape over. I've edited out this narration and merged the two sides together. You'll notice a slight break in speech at these points (typically about 40 minutes in ... 1/2 the time noted in the links). 



The Doctrine and Covenants Seminar

There was no introductory information on the first tape. It becomes clear that this seminar was also in Snowflake.
The year 1991 was used in a context that indicates this was the year this conference took place.

tape 1 - A volume of modern scripture (1:23:55)
tape 2 - The role of the living Prophet (1:25:21)
tape 3 - The new witness for Christ (1:28:40)
tape 4 - The idea of Zion (1:25:21 78.15mb)
tape 5 - The prophetic vision of Zion - part 1 (1:22:41)
tape 6 - part 2 (1:19:11)
tape 7 - The Temple, the eternal family of Christ (1:27:13)
tape 8 - Saviors on Mount Zion (1:14:34)
Tape 9 - The Church of Jesus Christ and the mission (1:28:40)
tape 10 - The peaceful millennial Kingdom of Christ (1:22:44)
tape 11 - The three divisions of Christ's coming - part 1 (1:23:19)
tape 12 - part 2 (1:20:12)
tape 13 - Jesus Christ, the great creator and redeemer (1:26:30)
tape 14 - Man and his relationship to God (1:19:51)
tape 15 - Resurrection and three degrees of glory - part 1 (1:20:24)
tape 16 - part 2 (1:29:56)
tape 17 - Great harvest season of last days - part 1 (1:22:56)
tape 18 - part 2 (1:27:27)
it appears that tape 18 was the end of the Snowflake seminar. 
not sure where the following tapes were given/made

first three appear to be in Hyrum's stake
tape 19 - Youth, repentance and Jesus Christ (0:51:42)
tape 20 - The doctrine of the fall (1:01:07)
tape 21 - Doctrine of spirit rebirth - basic plan of life - Moses 6 (0:58:18)
tape 22 - Doctrine of Election (1:18:27)
tape 23 - Power of resurrection and atonement (1:12:53)
tape 24 - Consecration and stewardship (0:14:29 13:)



The Pearl of Great Price Seminar:

There was no introductory information on the first tape, other than its apparent this seminar was also in Snowflake. I'm assuming it was within a year, plus or minus of the BoM seminar of August, 1989.

tape 1 -The Idea of the Temple in the Pearl of Great Price (1:57:48)
tape 2 - part 2 (0:7:26) appended to tape 1
tape 3 - Knowing God through the Pearl of Great Price (1:26:39)
tape 4 - Christ's Appearances to his prophets(1:46:41)
tape 5 - The creations of God - Worlds without Number - part 1(1:33:32)
tape 6 - part 2 (0:28:39)
tape 7 - The fall of Adam and the natural man (1:16:03)
tape 8 - Christ and his infinite atonement (1:55:39)
tape 9 - part 2 had about 5 minutes of questions from tape8 - appended to tape 8
tape 10 - The new birth and growing up in Christ (2:10:03)
tape 11 - part 2 had about 15 minutes which was appended to tape 10
tape 12 - Pre-Earth Life (1:06:59)
tape 13 - The Zion of Enoch (1:29:09)
tape 14 - Zion through the ages (1:28:52)
tape 15 - The Second Coming of Christ (2:08:05)
tape 16 - part 2 - appended to tape 15