1870
1058
1251
1837
1622
1249
1486
1940
1004
1430
1362
1414
1927
1672
1478
1513
1913
1546
1857
1939
1510
1004
1396
1297
1502
1447
1926
1545
1585
1900
1737
1411
1986
1814
1340
1320
1941
1846
1269
1737
1870
1636
1044
1648
1397
1694
1962
1784
1061
1789
1350
1251
1434
1627
1239
1474
1548
1905
1291
1222
1101
1823
1020
1009
1203
1484
1908
1843
1832
1044
1834
1180
1629
1974
1638
1608
1111
1803
1036
1214
1611
1793
1432
1860
1105
1335
1422
1320
1601
1971
1490
1980
1009
1733
1595
1285
1645
1724
1714
http://library.phcsuphan.ac.th/search.usisassist.php?fromrefcode=&keyword=%20Chemistry%20Textbooksมีปัญหาในการเชื่อมต่อ/Connection Problems (open url)