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Critical data on inorganic and organic compounds and pure substances. Features physical, thermodynamic, mechanical, and other key properties. Originally published from 1926-1930 for the National Research Council, now available in full-text searchable electronic format.
Originally published by Smithsonian Institution Press in 1954, this classic reference source comprises 901 tables of general interest to scientists and engineers, and of particular interest to those involved with physics in its larger sense.
Start by asking, "If these data exist (and they may not!), which organization would be the most likely to collect them?" You might have to piece the data together from a number of secondary sources if no one collects the exact data you need. Remember that data and statistics can often be found in journal articles, so don't forget to search article databases.
A global directory/catalog of research data repositories covering all academic disciplines. Search by topic or keyword to find a database relevant to your project.
Statistics can help put your project in context -- for example, if you're working on a project to purify drinking water, you might want to know how many people in a particular country have access to clean drinking water.