- Author: John J. Pitcairn Author Record # 113374
- Legal Name: Pitcairn, John James
- Birthplace: Parish of St Marylebone, Westminster, England, UK
- Birthdate: June 1860
- Deathdate: 10 May 1936
- Language: English
- Webpages: en.wikisource.org, librarything.nl
- Used These Alternate Names: Clifford Ashdown
- Note: Birth & death dates from The Big Book of Rogues and Villains Baptized on 1860-06-29.
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Novels
- The Queen's Treasure (1975) with R. Austin Freeman [only as by Clifford Ashdown]
- From a Surgeon's Diary (1975) with R. Austin Freeman [only as by Clifford Ashdown]
- The Adventure at Heath Crest (1904) with R. Austin Freeman [only as by Clifford Ashdown]
- How I Acted for an Invalid Doctor (1905) with R. Austin Freeman [only as by Clifford Ashdown]
- How I Attended a Nervous Patient (1905) with R. Austin Freeman [only as by Clifford Ashdown]
- How I Met a Very Ignorant Practitioner (1905) with R. Austin Freeman [only as by Clifford Ashdown]
- How I Cured a Hopeless Paralytic (1905) with R. Austin Freeman [only as by Clifford Ashdown]
- How I Helped to Lay a Ghost (1905) with R. Austin Freeman [only as by Clifford Ashdown]