There is a standard 3 letter abbreviations list, which is as follows:
OT:
GEN - Genesis
EXO - Exodus
LEV - Levitcus
NUM - Numbers
DEU - Deuteronomy
JOS - Joshua
JGS - Judges
RTH - Ruth
1SAM - 1 Samuel
2SAM - 2 Samuel
1KGS - 1 Kings
2KGS - 2 Kings
1CHR - 1 Chronicles
2CHR - 2 Chronicles
EZR - Ezra
NEH - Nehemiah
EST - Esther
JOB - Job
PSA - Psalms
PRO - Proverbs
ECC - Ecclesiastes
SOL - Song of Solomon
ISA - Isiah
JER - Jeremiah
LAM - Lamentations
EZE - Ezekiel
DAN - Daniel
HOS - Hosea
JOE - Joel
AMO - Amos
OBA - Obadiah
JON - Jonah
MIC - Micah
NAH - Nahum
HAB - Habakuk
ZEP - Zephaniah
HAG - Haggai
ZEC - Zechariah
MAL - Malachi
NT:
MAT - Matthew
MAR - Mark
LUK - Luke
JNO - John
ACT - Acts
ROM - Romans
1COR - 1 Corinthians
2COR - 2 Corinthians
GAL - Galatians
EPH - Ephesians
PHI - Philippians
COL - Colossians
1THS - 1 Thessalonians
2THS - 2 Thessalonians
1TIM - 1 Timothy
2TIM - 2 Timothy
TIT - Titus
PHN - Philemon
HEB - Hebrews
JAS - James
1PET - 1 Peter
2PET - 2 Peter
1JNO - 1 John
2JNO - 2 John
3JNO - 3 John
JUD - Jude
REV - Revelation
I think that is the whole list.
Thanks again for the work you are doing on this!