Carlton, Carla Harris. Barrel Strength Bourbon: The Explosive Growth of America’s Whiskey. Clerisy Press, 2017. First edition.
Carlton contrasts warehouse structure, thermal position and conditions. A ten-year Heaven Hill tasting shows different proofs on different floors, without a simple monotonic floor relationship. Nancy Fraley stresses wood and microclimate variation even among otherwise comparable barrels. Producers combine barrels to maintain a brand's house profile. Warehouse X is described as an ongoing environmental experiment.
Carla Harris Carlton, Barrel Strength Bourbon: The Explosive Growth of America’s Whiskey (Clerisy Press, 2017), Chapter 3 — warehouses and Warehouse X, supplied PDF screens 117–123.
Original PDF screen 123
Original PDF screen 117
Carlton, Barrel Strength Bourbon, supplied PDF screens 117–123.
Chapter 3 — warehouses and Warehouse X
Ready as a source locator, not independent claim verification. E-reader capture screens, not print pagination. Do not infer floor causation from one demonstration or treat research plans as published results. Screen 123's implication that single-barrel releases are never watered down conflicts with screen 78; separate single-barrel identity from bottling proof.
Source and locator
No access, Chapter 3 — warehouses and Warehouse X, supplied PDF screens 117–123. 
Formatted outputs
Carla Harris Carlton, Barrel Strength Bourbon: The Explosive Growth of America’s Whiskey (Clerisy Press, 2017), Chapter 3 — warehouses and Warehouse X, supplied PDF screens 117–123.
Short form: Carlton, Barrel Strength Bourbon, supplied PDF screens 117–123.
Bibliography: Carlton, Carla Harris. Barrel Strength Bourbon: The Explosive Growth of America’s Whiskey. Clerisy Press, 2017. First edition.
Usage map
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Verification checklist
Do not infer floor causation from one demonstration or treat research plans as published results. Screen 123's implication that single-barrel releases are never watered down conflicts with screen 78; separate single-barrel identity from bottling proof.