There are LOTS of interesting materials to be found! I found most of the major resource materials on Internet Archive, but a surprising array of materials can be found at EGW Writings.
The historical periodicals can be found at Adventist Archives,
and Adventist Digital Library.
Seventh-day Adventist Bible Commentaries:
SDABC V1 Introduction
SDABC V1 Genesis
SDABC V1 Exodus
SDABC V1 Leviticus
SDABC V1 Numbers
SDABC V1 Deuteronomy
SDABC V2 "The Ancient World"
SDABC V2 Joshua
SDABC V2 Judges
SDABC V2 Ruth
SDABC V2 1st Samuel
SDABC V2 2nd Samuel
SDABC V2 1st Kings
SDABC V2 2nd Kings
SDABC V3 "Poetry and Music in the Bible"
SDABC V3 "The Ancient World (circa 586-400 BC)"
SDABC V3 1st Chronicles
SDABC V3 2nd Chronicles
SDABC V3 Ezra
SDABC V3 Nehemiah
SDABC V3 Esther
SDABC V3 Job
SDABC V3 Psalms
SDABC V3 Proverbs
SDABC V3 Ecclesiastes
SDABC V3 The Song of Solomon
SDABC V4 "The Chronology of Old Testament Prophets"
SDABC V4 Isaiah
SDABC V4 Jeremiah
SDABC V4 Lamentations
SDABC V4 Ezekiel
SDABC V4 Daniel
SDABC V4 Hosea
SDABC V4 Joel
SDABC V4 Amos
SDABC V4 Obadiah
SDABC V4 Jonah
SDABC V4 Micah
SDABC V4 Nahum
SDABC V4 Habakkuk
SDABC V4 Zephaniah
SDABC V4 Haggai
SDABC V4 Zechariah
SDABC V4 Malachi
SDABC V5 "Between the Testaments"
SDABC V5 "The Fourfold Gospel Narrative"
SDABC V5 Matthew
SDABC V5 Mark
SDABC V5 Luke
SDABC V5 John
SDABC V6 "The Early Christian Church"
SDABC V6 "Roman History in New Testament Times"
SDABC V6 "Chronology of the Acts and Pauline Epistles"
SDABC V6 Acts
SDABC V6 Romans
SDABC V6 1st Corinthians
SDABC V6 2nd Corinthians
SDABC V6 Galatians
SDABC V6 Ephesians
SDABC V7 "The Medieval Church"
SDABC V7 "John and the Isle of Patmos"
SDABC V7 Phillippians
SDABC V7 Colossians
SDABC V7 1st Thessalonians
SDABC V7 2nd Thessalonians
SDABC V7 1st Timothy
SDABC V7 2nd Timothy
SDABC V7 Titus
SDABC V7 Philemon
SDABC V7 Hebrews
SDABC V7 James
SDABC V7 1st Peter
SDABC V7 2nd Peter
SDABC V7 1st John
SDABC V7 2nd and 3rd John
SDABC V7 Jude
SDABC V7 Revelation
SDABC V9 Bible Student's Source Book
Additional Reference Periodicals For Studies :
The 1843 Prophecy Chart
The Advent Herald, November 13, 1844
The Midnight Cry, 3 November 28, 1844
The Advent Herald, December 11, 1844
The Advent Mirror, January, 1845
The Voice of Truth, April 8, 1846
The Advent Review and Sabbath Herald January 26,1864
Historically Available Resource Materials:
"Analysis of Sacred Chronology," by Sylvester Bliss (Original Image Version).
"Analysis of Sacred Chronology," by Sylvester Bliss (Text Version).
"A Manual of the Ancient History of the East," by Francois Lenormant, a French archaeologist, assyriologist, and numismatist.
"Ancient Near Eastern Texts Relating to the Old Testament," Edited by James B. Pritchard. First edition was issued in 1950.
"A Sure Way to Find Out The True Religion," by Thomas Baddeley, a Roman Catholic Priest.
"A Historical View of the Council of Nice" by "Rev." Isaac Boyle.
"Theological Dictionary" by "Rev." Charles Buck.
Chambers' Cyclopedia Volume 1.
Chambers' Cyclopedia Volume 2.
Chambers' Cyclopedia Volume 3.
Chambers' Cyclopedia Volume 4.
Chambers' Cyclopedia Volume 5.
Chambers' Cyclopedia Volume 6.
Chambers' Cyclopedia Volume 7.
Chambers' Cyclopedia Volume 8.
Chambers' Cyclopedia Volume 9.
Chambers' Cyclopedia Volume 10.
Catechism of the Catholic Church, 2nd Edition, 1997 by the United States Catholic Conference.
"The Church History" by Eusebius, who lived between 260 and 339 AD.
"Enquiry: Whether the Lord Jesus Christ made the World and be Jehovah, and gave the Moral Law? And, Whether the Fourth Command be Repealed or Altered?" by Thomas Bampfield, 1692
"General History of the Christian Religion and Church" translated from the German of Dr. Augustus Neander, Volume 1.
"General History of the Christian Religion and Church" translated from the German of Dr. Augustus Neander, Volume 2.
"The History of the Decline and Fall of the Roman Empire" by Edward Gibbon (Abridged Version), known affectionately as the "Student's Gibbon".
"History of the Reformation of the 16th Century" by J.H. Merle D'Aubigne.
"The History of Romanism: From the Earliest Corruptions of Christianity to the Present Time" by "Rev." John Dowling, Pastor of the Berean Church, New York (1845).
"The History of the Sabbath," by Dr. Peter Heylyn, 1636.
"Italy and Her Invaders Volume 1" by Thomas Hodgkin.
"Italy and Her Invaders Volume 2" by Thomas Hodgkin.
"Italy and Her Invaders Volume 3" by Thomas Hodgkin.
"Italy and Her Invaders Volume 4" by Thomas Hodgkin.
"Italy and Her Invaders Volume 5" by Thomas Hodgkin.
"Italy and Her Invaders Volume 6" by Thomas Hodgkin.
The "Martyrology" of Charlotte Elizabeth, abridged from Foxe's Book of Martyrs.
A 1929 archaeological monograph, "Nabonidus and Belshazzar: A Study of the Closing Events of the Neo-Babylonian Empire."
"Plain Talk About the Protestantism of To-day," from the French of Louis Gaston Adrien de Segur, a French Bishop.
A 'pamphlet' containing the "Proceedings of the National Convention to Secure the Religious Amendment of the Constitution of the United States," held in Cincinnati, Jan. 31 and Feb. 1 1872.
"The Seven Great Monarchies Volume 1: Chaldaea, Assyria," by Sylvester Bliss (Original Image Version).
"The Seven Great Monarchies Volume 1: Chaldaea, Assyria," by Sylvester Bliss (Text Version).
"The Seven Great Monarchies Volume 2: Babylon, Media, Persia," by Sylvester Bliss (Original Image Version).