The method is frequently sought in digital formats for academic and private study. You can find reference copies and excerpts on several document-sharing platforms:
Aqui está uma sugestão de postagem focada no compartilhamento do Método Almeida Dias para Flauta
If you can find the PDF, use it as your "main textbook" for technique and scales, but supplement it with a book of fun solos or duets to keep the joy in your practice.