Information for my swapping list

1) The swapping list is sorted in the following steps:
1. Continent
2. Country
2. Territory / State / Province

2) In the column preceding the coordinates I indicate the accuracy of the sand collection place. Please see the links to the pdf-file on the main page or in the swapping Excel file.

3) Same Numbers with a different letter (e.g., 0156 and 0156a) are not sand variations of one collection site. They have an 'a' or 'b', because I received them from different people or collected them in two different years. Therefore, the collection date is different. Sometimes the collection site of one sample is more accurate than another but this will be indicated.

4) Three more explanations: In the first column I've indicated the amount of sand in ml I have of this sample: