Mt. Washington Cog Railroad, New
James Zipp
Wooding Up On The Mississippi 1863
Photo Researchers
1866 Steam Road Roller
Science Source
Cog Railway, Mount Washington, Nh #4
Larry Landolfi
The Titanic #1
Photo Researchers
Mauna Loa Eruption #1
Phil Degginger
Union Pacific Railroad Steam Locomotive
Richard Hansen
1866 Steam Road Roller
Science Source
1866 Steam Road Roller #2
Science Source
1866 Steam Road Roller #3
Science Source
Walking Through Steam Vent In Iceland
Greg Dimijian
Ash And Steam Eruption At Kilauea
Stephen & Donna O'Meara
Ash And Steam Eruption At Kilauea #1
Stephen & Donna O'Meara
Ash And Steam Eruption At Kilauea #2
Stephen & Donna O'Meara
Old Steam Train
Jim Corwin
Boston Terrier Steam Therapy
Jean-Michel Labat
Drive Wheels, Steam Locomotive
Inga Spence
Ice, Water, Steam
Charles D. Winters
Old Steam Locomotive
Kenneth M. Highfill
Eruption Of Mount St. Helens
Science Source
Flywheel Governor
Charles D. Winters
Golden Spike Ceremony, 1869
Science Source
Durango and Silverton Historic Train
Stuart Wilson and Photo Researchers
Watts Oscillating Engine
Science Source
Watts Oscillating Engine, 18th Century
Science Source
Watts Oscillating Engine #1
Science Source
Moon Over Erupting Kilauea Volcano
Stephen & Donna O'Meara
Kilauea Volcano
Stephen & Donna O'Meara
Ash Eruption, Kilauea Volcano
Stephen & Donna O'Meara
Kilauea Volcano #2
Stephen & Donna O'Meara
Sulfur Deposits
Stephen & Donna O'Meara
Ash Eruption, Kilauea Volcano #1
Stephen & Donna O'Meara
Littoral Explosion At Kilauea Volcano #1
Stephen & Donna O'Meara
Ash Eruption, Kilauea Volcano #2
Stephen & Donna O'Meara
Fumarole Crack
Krafft/Explorer
Grand Prismatic Spring
Tracy Knauer
Tiny Fumaroles
Gregory G. Dimijian, M.D.
Fumaroles In Yellowstone
Gregory G. Dimijian, M.D.
Ice Forms In Nature #2
John Shaw
Geothermal Power Plant
Inga Spence
Eruption Cloud At Kilauea Volcano
Stephen & Donna O'Meara
Littoral Explosion At Kilauea Volcano #2
Stephen & Donna O'Meara
Steam Bath, 19th Century
Wellcome Images
Narrow Gauge Steam Engine
Phil Degginger
Panama Canal Construction 1910
Photo Researchers
The Great Race For The Western Stakes
Photo Researchers
Treatments For Syphilis, 17th Century
Science Source
Richard Jordan Gatling
Science Source
Lava Fountain At Kilauea Volcano, Hawaii
Douglas Peebles
Lava Streams Into The Ocean, Kilauea
Douglas Peebles
Lava Streams Into The Ocean, Kilauea #1
Douglas Peebles
Pressure Gauge And Rust
Mike Agliolo
Kilauea Volcano, Hawaii #1
Douglas Peebles
Mount Pinatubo Caldera #1
Stephen & Donna O'Meara
Lava Streams Into The Ocean, Kilauea #8
Douglas Peebles
Goupils Flying Machine, 1883
Science Source
Goupils Flying Machine, 1883 #1
Science Source
Thermograms Of Heating Up Water #1
GIPhotoStock
White Island Volcano, New Zealand
G. R. Roberts
Cog Railway, Mount Washington, Nh #1
Larry Landolfi
Cog Railway, Mount Washington, Nh #3
Larry Landolfi
Cog Railway, Mount Washington, Nh #5
Larry Landolfi
Woman Ironing An Apron, C.1970s
H. Armstrong Roberts/ClassicStock
Matthew Boulton, English Manufacturer #1
Wellcome Images
Matthew Boulton, English Manufacturer #2
Wellcome Images
New York Elevated Railway, 19th Century
Wellcome Images
Northern Pacific Railroad Work Party
Science Source
Taal Volcano Erupting #2
Josephus Daniels
Mount Mayon Volcano #2
Josephus Daniels
Geothermal Power Plant Calpene Unit 7-8
Theodore Clutter
Binary Geothermal Power Plant #2
Theodore Clutter
Geothermal Well, Separators And Pipe
Theodore Clutter