Estonia's June 19, 2001 booklet featuring illustrations by Edgar Valter contains two panes of 4 stamps each. One pane has 3.60 kroon stamps, and the other, 4.40 kr. stamps. The booklet sold for 35 kroon, the excess 3 kr. over face being a donation to the Estonian Nature Fund.
The upper right stamp (Sc. #418b) from the 3.60 kr. pane depicts an owl on a nest with 2 eggs.