Abnormal sample plot

agricultural geological survey sample

Complex sample survey

fixed sample plot

geological survey sample

Permanent sample plot

remote sensing interpretation sample plot

remote sensing sample survey

sample plot

sample plot method

Sample plot positioning

sample survey

small sample plot method

social sample survey

square sample plot

The Second China National Sample Survey on Disability

the Second China National Sample Survey on Disabil

Plot-survey

Cross-section Survey and Profiles Survey