He stood out for his uncommon objectivity and fidelity to documents, while the "official history" was still systematically mythified in grandiloquent speeches that disseminated a series of factual errors about the city's formation.

For years he kept, in his barbershop, the Informative Center of the History of Caxias, where he accumulated a vast amount of historiographic material, and published in the press several articles and chronicles on specific themes.

As he grew older, he was often consulted by teachers and students on his favorite subject and gave numerous lectures at the University of Caxias do Sul, in schools, cultural groups, and other venues.

His masterpiece is História de Caxias do Sul, divided into 7 volumes and published between 1951 and 1981, which is a basic reference for the knowledge of local history until today.

The priceless documental collection he gathered along the years was donated by his descendants to the João Spadari Adami Municipal Historical Archive, which, since 1997, bears his name in memory and in honor of his work.

[10] In the words of Mario Gardelin,Few people have been so passionate about an ideal and dedicated so much constant effort to it as João Spadari Adami to the history of Caxias do Sul.

[8]In Décio Bombassaro's opinion, His work had a clear objective: to bring to light the true events that preceded and were decisive in the founding of Caxias do Sul.

For the journalist and historian Mário Gardelin, when one examines the work of João Spadari Adami and his contribution to the history of Caxias do Sul, one is amazed at how much he did, with so few means at his disposal.

On the one hand, he leaned on his instinct as a man passionate about history, of which, however, he did not have a mythical or heroic vision, but a pure taste for knowledge and knowing the facts.