captain discovered the abundant quantities of guano on Aves and systematic collection started not long after. Both the Dutch and Venezuelan authorities found out and protested. The Dutch sent a warship to Aves. Its captain found Americans loading guano. He informed them that the Dutch considered Aves to belong to the Netherlands. The island was once again involved in controversy in 1857 when three Boston men, "Mesers Shelton, Samson and Tappan", were in a dispute with the Venezuelan government after they "annexed" the island "which they had discovered in an abandoned condition"; this was done in accordance with the recently passed United States Guano Islands Act. In the meantime, in 1859, the Administrator of St. Eustatius granted a concession to collect guano on Aves to ‘Edward Green, Kean & Co.’ in Baltimore at f. 2.50 per ton. He decided that “even though Aves was never permanently settled by the Dutch, the inhabitants of Statia and Saba had made use of the island longer than anyone can remember,” which “constituted proof of possession.” He gave a provisionary concession and asked the Governor in Curaçao to confirm. The Governor, meanwhile, had received a request to mine guano on Aves from a group of businessmen on Dutch St. Maarten, “who had assured themselves that Aves was recognized as a possession of the Dutch government.” The Dutch authorities on Curaçao, under whom St. Eustatius and Saba fell, sat down with the Venezuelans and together decided to find a mutually acceptable sovereign to decide about the ownership of Aves Island. The Queen of Spain was accepted by both parties, and in 1865 Isabella II ruled on the issue, deciding in favor of the Venezuelans. However, Isabella's judgment acknowledged the time honored rights of the inhabitants of the Dutch islands St. Eustatius, Saba and St. Maarten to fish in the waters around Aves. As this was the main issue the Dutch had, they accepted the ruling. Later, some Dutch historians argued that Isabella's advisors could have mixed up Aves with Las Aves Archipelago lying between Bonaire and Los Roques, just off the coast of Venezuela. From 1878 to 1912, the island was again occupied by American guano miners until supplies were exhausted. Isla de Aves was included in Venezuela's territorial reorganization done by President Joaquín Crespo in 1895. By 1905, Isla de Aves was a municipality called "Municipio Oriental" part of Colón Federal Territory. In 1950,