In the latests omnibuses, all of Geof Johns' work is collected.
Here are the contents of the Omnibuses,
the underlined stories are not collected (because not written by Geoff Johns):
Prequel: Parallax arc <- not in the omnibuses
1.
GL: Emerald Dawn (GL: Emerald Dawn #1-6)
2.
GL: Emerald Twilight / New Dawn (GL vol.3 #48-55)
3.
GL: Baptism of Fire (GL vol.3 #59, 66-67, 70-75)
4.
Zero Hour: Crisis in Time (Zero Hour: Crisis in Time 4-0 + Showcase '94 #8-9)
5.
The Final Night (Final Night #1-4 + Parallax: Emerald Night #1)
Green Lantern omnibus by Geoff Johns - book 1
1. GL: Rebirth (GL: Rebirth #1-6)
2. GL: No Fear (GL vol.4 #1-6 + GL Secret Files and Origins 2005: Flight)
3. GLC: Recharge (GLC: Recharged #1-5)
4. Infinite Crisis: Crossover (GL vol.4 #7-8)
5. GL: Branded (GL vol.4 #9)
6. GL: Revenge of the Green Lanterns (GL vol.4 #10-13) - the collected edition contains GL vol.4 #7-13
7.
GLC: To be a Lantern (GLC vol.2 #1-6)
8. GL: Wanted - Hal Jordan (GL vol.4 #14-17)
9. GL: Mystery of the Star Sapphire (GL vol.4 #18-20)
10.
GLC: The Dark Side of Green (GLC vol.2 #7-13)
11. GL: The Sinestro Corps War (GL vol.4 #21-25 + GLC vol.2 #14-18 + GL: Sinestro Corps Special #1)
12.
GL: Tales of the Sinestro Corps (GL #18-20 backup stories (collected) + GL: Sinestro Corps Special (collected) +Tales of the Sinestro Corps: Parallax + Tales of the Sinestro Corps: Cyborg Superman + Tales of the Sinestro Corps: Superman-Prime + Tales of the Sinestro Corps: Ion + Sinestro Corps: Secret Files)
13.
GLC: Sinestro Corps War epiloge (GLC vol.2 #19) - only in the Sinestro Corps War collected editions
Green Lantern omnibus by Geoff Johns - book 2
1.
GLC: Ring Quest (GLC vol.2 #20-26)
2. GL: The Alpha-Lantern (GL vol.4 #26-28)
3. GL: Secret Origin (GL vol.4 #29-35)
4.
GLC: Eye of the Beholder (GLC vol.2 #27-28)
5.
Final Crisis (Final Crisis #1-7)
6.
Ion: The Torchbeared (Ion #1-6)
7.
Ion: The Dying Flame (Ion #7-12)
8. GL: Rage of the Red Lanterns (Final Crisis: Rage of the Red Lanterns #1 + GL vol.4 #36-38)
9.
GLC: Sins of the Start Sapphire (GLC vol.2 #29-32)
10. GL: Agent Orange (GL vol.4 #39-42)
11.
GLC: Emeral Eclipse (GLC vol.2 #33-38)
12. Blackest Night (Blackest Night #0-8 + DC Univers #0 + Untold Tales of Blackest Night #1 + Blackest Night: Tales of the Corps #1-2)
13. GL: Blackest Night - War of Light (GL vol.4 #43-52)
14.
GLC: Blackest Night - War of Light (GLC vol.2 #39-47)
15.
Blackest Night: Tales of the Corps #3
Green Lantern omnibus by Geoff Johns - book 3
1.
Brightest Day (Brightest Day #0-24)
2. GL: Brightest Day - The New Gardians (GL vol.4 #53-62)
3.
GL: Emerald Warior - Brightest day (GL: Emeral Warior #1-7)
4.
GLC: Revolt of the Alpha Lanterns (GLC vol.2 #21-22,48-52)
5.
GLC: The Weaponer (GLC vol.2 #53-57)
6. GL: War of the Green Lanterns (GL: Emerald Warriors #8-10 + GL vol.4 #63-67 + GLC vol.2 #58-60)
7.
War of the Green Lanterns: Aftermath (War of the Green Lanterns Aftermath #1-2, GLC #61-63, GL: Emerald Warriors #11-13)
8. GL: Larfleeze Christmas Special (GL: Larfleeze Christmas Special #1)
9.
Flashpoint (Flashpoint #1-5)
10.
Flashpoint: The World of Flashpoint Featuring Green Lantern (Hal Jordan #1-3 + Abin Sur the Green Lantern #1-3 + Frankenstein and the Creatures of the Unknown #1-3 + Green Arrow Industries #1)
11. GL: Sinestro (GL vol.5 #1-6) - New 52
12.
GLC: Freasome (GLC vol.3 #1-7) - New 52
13.
Red Lanterns: Blood and Rage (Red Lanterns #1-7) - New 52
14.
GL, New Guardians: Ring Bearer (GL: New Guardians #1-7) - New 52
15. GL: Revenge of the Black Hand (GL vol.5 #7-12 + GL Annual #1) - New 52
16.
GLC: Alpha War (GLC vol.3 #8-14,0) - New 52
17.
Red Lanterns: The Death of the Red Lanterns (Red Lanterns #8-12 & Stormwatch #9) - New 52
18.
GL, New Guardians: Beyond Hope (GL: New Guardians #8-12)
19. GL: The End (GL vol.5 #0, #13-20) - New 52
Aftermath: New 52 crossovers and spin-offs <- not in the omnibuses
1.
GL: Rise of the Third Army (GL #13-16 + GLC #13-16 + GLC Annual #1 + Red Lanterns #13-16 + GL: New Guardians #13-16)
2.
GL: The Wrath of the First Lantern (GL #17-20 + GLC #17-20 + Red Lanterns #17-20 + GL: New Guardians #17-20)
3.
GL: Lights Out (GL #24 + GLC #24 + GL: New Guardians #23-24 + Red Lanterns #24 + GL Annual #2 + GL #23.1)
4.
Red Lanerns: Atrocities ( Red Lanterns #27-34 + GL #28 + Red Lanterns Annual #1 + Supergirl #31)
5.
GL: Test of Will (GL #27-34 + GLC #31-33)
6.
Sinestro - 4 volumes
7.
Larfleeze - 2 volumes
8.
Green Lantern/New Gods: Godhead (Green Lantern/New Gods: Godhead + GL #35-37 + GLC #35-37 + GL: New Guardians #35-37 + Red Lanterns #35-37 + Sinestro #6-8 + GL Annual #3)
Other
Other
GL: In Brightest Day - Geoff Johns selects and provides commentary on his favorite tales of the Emerald Guardian (GL #7, 40, 59, 162, 173, 177, 182, 183, 188 + GL vol.2 #51 + GLC Quarterly #6 + GLC annual #2)
I hope this answers your question