|
Simple Machines - Using Mechanical Advantage
Halberstadt (Hans) And Darnell (Larry) Barr Films
|
1979 |
Halberstadt (Hans) And Darnell (Larry) Barr Films |
|
|
|
Oxygen: An Introduction to Chemistry
Halberstadt and Darnell
|
|
Halberstadt and Darnell |
5:40 |
Oddball Film and Video |
|
Oxygen - An Introduction To Chemistry
Halberstadt (Hans) And Darnell (Larry) Barr Films
|
1979 |
Halberstadt (Hans) And Darnell (Larry) Barr Films |
|
|
|
Electricity - The Energy Of Electrons
Halberstadt (Hans) And Darnell (Larry) Barr Films
|
1979 |
Halberstadt (Hans) And Darnell (Larry) Barr Films |
|
|