Budget proposal casts doubt over physics portal's future.
Butler
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D002017:Budgets; D016206:Databases, Bibliographic; D005380:Financing, Government; D006076:Government; D007256:Information Systems / Q000191:economics / Q000331:legislation & jurisprudence; D020407:Internet; D009317:National Library of Medicine (U.S.); D010825:Physics / Q000191:economics; D017149:Private Sector; D017150:Public Sector; D011643:Publishing / Q000191:economics; D014481:United States