Answer the following question: Information:  - Velgarth is the planetary setting created by Mercedes Lackey, the author of the Valdemar Saga novels. The continents are not named. The Valdemar Saga primarily focuses on the story of the nation of Valdemar, and according to Mercedes Lackeys official bibliography, there are thirty novels and seven anthologies.  - Mores (especially in UK English, sometimes ; from Latin "mrs", , plural form of singular "ms", meaning "manner", "custom", "usage", "habit") is a term introduced into English by William Graham Sumner (18401910), an early U.S. sociologist, to refer to social norms that are widely observed and are considered to have greater moral significance than others. Mores include an aversion for societal taboos, such as incest. The mores of a society usually predicate legislation prohibiting their taboos. Often, countries will employ specialized vice squads or vice police engaged in suppressing specific crimes offending the societal mores.  - Mercedes Ritchie Lackey (born June 24, 1950) is an American writer of fantasy novels. Many of her novels and trilogies are interlinked and set in the world of Velgarth, mostly in and around the country of Valdemar. Her Valdemar novels form a complex tapestry of interaction between human and non-human protagonists with many different cultures and social mores.  - This is a list of books by Mercedes Lackey , arranged by collection .    What is the relationship between 'mercedes lackey bibliography' and 'bibliography'?
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instance of