During the early 20th century Aden was a notable centre of coffee production. Women processed coffee beans, grown in the Yemen highlands. Frankincense, wheat, barley, alfalfa, and millet was also produced and exported from Aden. The leaves and stalks of the alfalfa, millet and maize produced in Aden were generally used as fodder. As of 1920, Aden was also gathering salt from salt water. An Italian company called Agostino Burgarella Ajola and Company gathered and process the salt under the name Aden Salt Works. There was also a smaller company from India, called Abdullabhoy and Joomabhoy Lalji & Company that owned a salt production firm in Aden. Both companies exported the salt. Between 1916 and 1917, Aden produced over 120,000 tons of salt. Aden has also produced potash, which was generally exported to Mumbai.