The Harry Price Website gives an excellent, succinct overview of these publications:
The book describes the protocols required when visiting the Rectory in the capacity of an official observer of the University of London Council for Psychical Investigation, in connection with vigils inside the building & within its grounds, report writing & procedures for dealing with phenomena. The pamphlet also gives a résumé of all the principle paranormal events which had been reported as having occurred in or around the former Bull residence over the years & this was seized upon by Price's critics after his death as his way of using the powers of suggestion in order to influence his observers into reporting things which he could subsequently use to his advantage when writing about the case after the tenancy had come to an end.
I love the air of officialdom bestowed on this pamphlet by the restrained, authoritarian typography. Having grown up in a military family and then worked in the UK's Civil Service, they remind me of all sorts of far more credible documents I have encountered over the years.
But what do the pamphlets say? Alas I can't find anywhere on the web where the interior has been reproduced, either as a scan or just transposed text. If anyone know where I can find a copy, do please comment below.
At present, my imagination is running wild. I am hoping that these things are as bizarre as the Handbook for the Recently Deceased found by Geena Davis and Alec Baldwin in, Beetlejuice (a book so impenetrable Baldwin gives up trying to decipher it, complaining that it reads like "stereo instructions").