Twelve Prophets Book
Lives of the prophets (1st century)

Hosea

R. Patterson: exegetical commentary.
Hos. 12 W.C. Kaiser: JETS PDF.

Joel

Locust infestations in
1915, 2004 and 2013: - Moving images; Informative report with many photos, kosher-locusts-Segula PDF
More here Joel 2:23

Amos

Earthquake: G. Franz ; and A. Maeir
About Am. 3: Ivory carving

Obadiah

About Edom

Jonah

For the location of Nineveh and other cities in the Assyrian empire, see  bible land maps.

For the walls and dimensions of Nineveh: click here
For Jonah's grave in Mosul and its destruction in 2014, see here.
Jon. 1:3 Jafo/Joppe:
Jon. 2: E.B. Davis
The big fish: see here and also here.
Sarcofago di Giona (from c. 300); More photos, see here 
Nabi Yoûnis:
Jon. 4: Miracle tree and worm: Bible Notes 1 and bible notes 2. 
Hausmann, Müller PDF:

Micha

Mi. 5:1 Seal with the name Bethlehem: and also here.
Mi. 6:3-5;
Mi. 6:8

Nahum

For Assyrian depictions of lions and of gruesome treatment of captives, see here.

Sephania

Irsigler, H., 'Zephaniah/Zefanjabuch', June 2008.
Sef. 2:4 Assyrian fortifications in Asdod

Zacharia

Zachariah Cemetery, see here and here
Zech. 1: Pasargardae garden
Zech. 4: Lamp with seven spouts
Cassiterite or tin lead
Zech. 12 J. Blazs PDF
The Messiah, son of Joseph
Zech. 14:4 Relationship between Mount of Olives and tombs, see here
14:5: Plea for landslide, see here
14:16: The Feast of Tabernacles and Christians from the nations, see here

Malachi

Mal. 3: Kaiser on Elijah in the Gospel (PDF), see here

On excursion 'God and evil'
Crenshaw PDF
Meister

On excursion 'Messiah expectation'
Historical overview
Jewish Encyclopedia

At excursion 'The origin of the prophetic books'
Lessing PDF
Barrick

At excursion 'Salvation for remnant'
Johnson PDF
Mulder
Wallet