共 18 条
[1]
ALLDREDGE RB, 1973, TRENDS OCT, P20
[2]
BOSTER MA, 1972, 10 U AR DEP HYDR WAT
[3]
Cicchetti C.J., 1973, SOC SCI RES, V2, P15, DOI DOI 10.1016/0049-089X(73)90019-7
[4]
CICCHETTI CJ, 1976, COSTS CONGESTION
[5]
Clawson M., 1966, EC OUTDOOR RECREATIO
[6]
FISHER AC, 1972, NAT RESOUR J, V12, P417
[7]
GODFREY EB, 1972, ANNUAL M WESTERN AGR
[9]
HELD RB, 1969, STUDY DEV PRACTICAL
[10]
LAPAGE WF, 1963, J FORESTRY, V61, P322