Belgium tree:

Cover showing receipt of seeds from Australia. The reddish color hand-stamp shows that the shipment was cleared by the U.S. Department of Agriculture.

Stan Lemaster had seedlings planted a total of twenty-nine (29) countries including England, Sweden, Denmark, Ireland, Canada, France, Germany, Switzerland, Belgium, Poland, Lithuania, Yugoslavia, Hong Kong, Singapore, Iran, China, Japan, Australia, New Zealand, Philippines, Taiwan, Korea, Turkey, Russia, Zimbabwe, Mexico, Columbia, Jamaica, Spain, and the Antarctica.
Add this to Stan's famous tree seedling plantings in over two hundred (200) US cities in all fifty (50) states you can see that how prolifically he spread beauty and knowledge all around.