Environmental issues and problems : water /

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100 1 ‡aSchwille, Robert W.
245 1 0 ‡aEnvironmental issues and problems : ‡bwater / ‡cprepared by Robert W. Schwille ... [et al.].
260 ‡aHarrisburg : ‡bBureau of Curriculum Services, Pennsylvania Dept. of Education, ‡c1974.
300 ‡a40, [1] leaves : ‡bill. ; ‡c28 cm.
538 ‡aMode of access: Internet.
590 1 ‡aCARLI Last Copy Program.
650 0 ‡aWater ‡xPollution.
710 1 ‡aPennsylvania. ‡bBureau of Curriculum Services.
740 0 0 ‡aWater.
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DAT 2 ‡a2019-08-23T18:00:02Z ‡b2019-09-27T20:00:02Z
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