The Pancha Rudra hymns (5 Suktas) and a few other Mantras which has ”Rudra” as Pada, are recited together as a custom, and collectively form the Pancha Rudra.
These mantras belong to different Adhyaayas and Ashtakas (Chapters) of Rig Veda.
This book contains the Pada Patha, Samhita Patha and Ghana Patha of the given mantras.
As a side note, there are interesting articles on Veda, its branches, mathematics, Chandas, Astrology, General Equation of Krama, Jata, Ghana etc. (in English)