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In 1884 he made an expedition to the shores of high-altitude Lake Titicaca in Peru, with astronomical equipment packed in by mule train.

For example, plugging a well site in Guadalupe Mountains National Park in Texas will entail an agency airdrop of big equipment, like drilling machinery and skid steers, while workers and lighter gear will reach the site by mule train.

After two voyages, Drake quit and formed an alliance with escaped slaves to knock off a Spanish mule train carrying gold and silver across Panama.

Squads of scientists have packed in 1,000 pounds of gear by mule train for riverscape surveys, counting fish in every riffle, glide and pool.

In Mississippi, they’ll help the city of Marks redesign the park where the Rev. Martin Luther King Jr. began the Poor People’s Campaign, leading a mule train to Washington in 1968.