If you're unable to find the specific PDF you're looking for, consider reaching out to music education communities, forums, or directly to publishers that specialize in music education materials. They might be able to provide guidance or direct you to where you can find the resources you need.
Here is the honest answer. They are actively published by Editions Musicales Agostini (often distributed through Carisch or Hal Leonard in different territories). solfeo+ritmico+dante+agostini+libro+1+pdf
If you're looking for a specific download link or purchase information, I recommend searching through reputable music education websites or contacting publishers directly associated with Dante Agostini's works. If you're unable to find the specific PDF