Subject
Astronomy
3
Observations, Astronomical.
2
Physics.
2
Astrophysics
1
Birds of prey
1
Differential equations
1
Drainage
1
Functional differential equations
1
Gravitation.
1
Integro-differential equations.
1
Irrigation
1
Mathematical physics
1
Physics
1
Plasma (Ionized gases)
1
Space sciences.
1
Statistics.
1
Volterra equations.
1