I am currently seeking to find either the movies, or any further information about the below mondo movies, in the hope these can be located somehow:
Il Mondo si spoglia (e si traveste)
Il Mondo sulle spiagge
Nudo Crudo e… - 1964, Adriano Bolzoni & Francesco De Feo
Pelle degli altri, La (Nigeria in fiamme) - 1970, Marino Marzano