I need a land evaluation certificate for 1981

If you require a land valuation certificate from 1981 for capital gains tax purposes, particularly for ancestral property in Bhagalpur, Bihar, you'll need to engage a certified, registered property valuer. These valuers are typically registered with the income tax department. You can find them by searching online, asking your Assessing Officer (AO) jurisdiction for a list, or consulting your Chartered Accountant (CA) or a knowledgeable friend.