1777
1670
1908
1559
1025
1780
1683
1318
1053
1414
1496
1374
1812
1732
1811
1457
1291
1112
1151
1826
1411
1475
1618
1636
1367
1459
1722
1350
1374
1638
1547
1773
1222
1037
1555
1551
1467
1060
1819
1756
1746
1050
1048
1001
1483
1608
1735
1869
1265
1331
1768
1787
1908
1320
1543
1913
1291
1757
1363
1762
1397
1877
1751
1088
1651
1836
1300
1655
1469
1934
1051
1301
1809
1682
1816
1019
1814
1343
1642
1580
1851
1712
1037
1359
1342
1518
1139
1736
1877
1121
1862
1904
1036
1239
1678
1971
1234
1680
1048
http://library.phcsuphan.ac.th/search.usisassist.php?fromrefcode=&keyword=%20Chemistryมีปัญหาในการเชื่อมต่อ/Connection Problems (open url)