Hydrogen Industry : The hydrogen economy : opportunities and challenges / edited by Michael Ball, Martin Wietschel.
Hydrogen Industry United States : The hydrogen economy : opportunities, costs, barriers, and R&D needs / Committee on Alternatives and Strategies for Future Hydrogen Production and Use, Board on Energy and Environmental Systems, Division on Engineering and Physical Sciences, National Research Council and National Academy of Engineering of the National Academies.
Hydrographic Surveying Spratly Islands : A geographical description of the Spratly Islands and an account of hydrographic surveys amongst those islands / by David Hancox and Victor Prescott ; edited by Clive Schofield.; Hancox, David.
Hydrologic Cycle : The global water cycle : goechemistry and environment.; Berner, Elizabeth Kay.
Hydrologic Cycle Europe : Forest management and the water cycle [electronic resource] / Michael Bredemeier, Shabtai Cohen, Douglas L. Godbold, Elve Lode, Viliam Pichler, Patrick Schleppi, editors.; Bredemeier, Michael.
Hydrology Congresses : Climate change and its effects on water resources [electronic resource] : issues of national and global security / edited by Alper Baba ... [et al.].; NATO Advanced Research Workshop on Effect of Climate Change on Water Resources: Issues of National and Global Security