U.S. Geological Survey circular (Online)

no.980; no.1081 1993; no.1120-F 1993; no.1120-I 1993; no.1181 1999; no.919 1983; no.921 1984; no.923 1984; no.929 1983; no.930-B 1984; no.930-J 1990; no.930-N 1993; no.931 1984; no.932 1984; no.933 1984; no.935 1984; no.936 1984; no.937 1984; no.938 1984; no.942 1984; no.946 1985; no.947 1987; no.948 1986; no.949 1985; no.953 1987; no.956 1987; no.957 1987; no.962 1985; no.966 1985; no.967 1985; no.968 1987; no.975 1987; no.977 1986; no.980; no.981 1987; no.984 1986; no.991 1987; no.994 1987; no.996 1988; no.997 1988; no.998 1987; no.1003 1987; no.1006 1987; no.1008 1987; no.1009; no.1010 1986; no.1012 1987; no.1013 1988; no.1015 1987; no.1016 1988; no.1017 1988; no.1018 1988; no.1019 1988; no.1022 1988; no.1023 1988; no.1024 1989; no.1025 1988; no.1026 1989; no.1036 1990; no.1042 1991; no.1044 1989; no.1045 1989; no.1046 1990; no.1047 1990; no.1049 1990; no.1051 1990; no.1053 1990; no.1057 1990; no.1061 1990; no.1064 1991; no.1068 1991; no.1069 1992; no.1072 1991; no.1075 1990; no.1076 1992; no.1078 1992; no.1079 1992; no.1080 1992; no.1081 1993; no.1082 1992; no.1084 1992; no.1086 1993; no.1089 1992; no.1091 1992; no.1093 1992; no.1094 1993; no.1098 1993; no.1101 1991; no.1103-A 1994; no.1103-B 62556477; no.1104 1994; no.1105 1993; no.1106 1994; no.1107 1994; no.1108 1995; no.1113 1994; no.1114 1992; no.1115 1993; no.1116 1994; no.1117 1995; no.1119 1996; no.1120-A 1993; no.1120-B 1993; no.1120-C 1993; no.1120-D 1993; no.1120-E 1993; no.1120-F 1993; no.1120-G 1993; no.1120-I 1993; no.1120-K 1993; no.1121 1993; no.1122 1995; no.1124 1995; no.1126 1996; no.1129 1995; no.1131 1997; no.1133 1995; no.1138 1997; no.1140 1997; no.1141 1997; no.1142 1997; no.1148 1997; no.1152 1994; no.1153 1998; no.1173-D 2000; no.1180 1999; no.1181 1999; no.1184 1999; no.1199 2000; no.1201 2000; no.1225 1999; no.920-924; no.953-954,956-957 1987; no.966-970; no.971-975; no.976-979; no.1002-1004; no.1008-1012; no.1013-1018; no.1019-1025; no.1066-1072 1990-91; no.1073-1080; no.1091-1094 1992-1993; no.1101-1105 1991-93; no.1106-1109 1994-95; no.1110-1115 1993; no.1116-1119 1993; no.1120A-I 1993; no.1120J-L 1993; no.1121-1125 1993-1994; no.1126 1996; no.1126 rev.1996, 2000; no.1129-1132 1995-97; no.1134 1996; no.1136-1142 1996-1997; no.1143 2001; no.1144 1998; no.1145 1998; no.1148 1997; no.1151 1998; no.1152 1997; no.1153 1998; no.1155 1998; no.1156-1163 1992-95; no.1164-1170 1992-96; no.1172 1998; no.1173A-D 1999-2000; no.1174 1998; no.1175 2001; no.1178 2000; no.1180 1999; no.1182 1999; no.1184 1999; no.1186 1999; no.1187 1999; no.1188 1999; no.1191 2000; no.1192 1999; no.1193 2000; no.1195 2000; no.1198 2000; no.1199 2000; no.1200 1998; no.1201 2000; no.1202 2000; no.1214 2000; no.1215 2000; no.1218 2001; no.1224 2002; no.1225 1999; no.1232 2004; no.1240 2004; no.1242 2003; no.1245 2003; no.1247 2003; no.1248 2003; no.1249 2003; no.1250 2003; no.1254 2004; no.1268 2004; no.1280 2005; no.1200 1995; no.1120:D 1993; no.1057 1988; no.1044 1987; no.1015 1987; no.1001 1980; no.926 1985; v.1018; no.1223*; no. 1181; no. 1178; no. 1185:A; no. 1185:B; no. 1210; no. 1217; no. 1221; no. 1222; no. 1223