Question

Diaries and accounts of pilgrims are examples of

Answer 1

Diaries and accounts of pilgrims are examples of official record

Answer 2

Answer:

Diaries and accounts of pilgrims are examples of  Survey reports.  

Explanation:  

The most suitable answer is survey reports. Dairies and accounts of pilgrims are non-official records. These records are not official.  

But, it can come under the category of survey reports as generally surveys are conducted on how many pilgrims visit. For example, Haridwar on daily basis or number of people attending Kumbh Mela. Even personal dairies can come under same category for percentage of people who still keep personal diaries.