Here are two lists of books on Fluid Dynamics/Fluid Mechanics.
1. Batchelor, G.K. Introduction to Fluid Dynamics, Cambridge Univsrsity Press 1967
2. Landau and Lifsh!tz, Fluid Mechanis (2nd Ed.), Pergamon Press 1987.
3. Milne-Thomson, L.M. Theoretical Hydrodynamics, McMillan (3rd or 5th Ed.) 1955 (3rd).
4. Lighthill, M.J. An Informal Introduction to Theoretical Fluid Mechanics, Clarendon Press 1986.
5. Prandtl, L. Essential of Fluid Dynamics, Hafner 1952.
6. Lamb, Hydrodynamics (6th Ed.), Cambridge University Press 1932
7. Courant and Freidrichs, Supersonic Flow and Sock Waves, Interscience 1948.
8. Meyer, An Introduction to Mathematical Fluids Dynamics, Dover 1971.
Pedlosky, J., Geophysical Fluid Dynamics, Springer Verlag
(complements Gill, emphasizing QG dynamics, Rossby waves, baroclinic instability, non-dimensional scaling)
James, I.N. Introduction to Circulating Atmospheres, Oxford Univ. Press (good basic discussion of modern atmospheric circulation dynamics)
many good review papers on GFD of A and O can be found in Annual Reviews of Fluid Mechanics, a yearly hard-bound collection.
Meteorology at the Millenium, R.B.Pearce Ed., Academic Press (a recent collection of review papers on atmospheric circulation some with a GFD emphasis).
Large-Scale Dynamical Processes in the Atmosphere. Academic Press, Hoskins and Pearce Eds. (an old (1983) yet still excellent set of review papers on basic circulation)
Evolution of Physical Oceanography MIT Press,Warren and Wunsch Eds. (also old, ca. 1981, yet excellent review papers on physical oceanography, general circulation).
Acheson, D. Elementary Fluid Mechanics, Oxford Univ. Press (excellent, terse introduction to classical fluid mechanics)
Lighthill, M.J., An informal introduction to theoretical fluid mechanics. Oxford Univ. Press (especially expert discussion by a master of vorticity, and of sound propagation)
Lighthill, M.J., Waves in Fluids. Cambridge Univ. Press (basic wave mathematics, of non-dispersive and dispersive wave types; ray-tracing; internal and Rossby waves).
Whitham, G.B. Linear and Nonlinear Waves. Wiley and Sons (a remarkable presentation of non-dispersive and dispersive waves from a fundamental mathematical point of view).
Salmon, R., Lectures on Geophysical Fluid Dynamics, Oxford Univ. Press (another remarkable, recent text treating mostly large-scale QG oceanic GFD but with
fundamental ideas about fluid dynamics based on Hamilton’s principle)
James, I., Introduction to Circulating Atmospheres (readable discussion of basic GFD of the large-scale atmosphere)
Batchelor,G.K., An Introduction to Fluid Dynamics, Cambridge Univ. Press (impeccable reference on basic incompressible fluids, vorticity, strain, boundary layers)
Kundu,P. Fluid Dynamics, Academic Press (includes sections on elementary GFD)
Tritton, D., Physical Fluid Dynamics (basic fluids from a GFD point of view).
Van Dyke,M. An Album of Fluid Motion, Parabolic Press (amazing photographs of basic fluid dynamics).
Landau and Lifsh!tz, Fluid Mechanics, Second Edition : Volume 6 (Course of Theoretical Physics) Not too expensive, and it seems reasonably comprehensive.