Section 35AC approvals designate specified institutions and projects as eligible for tax-exempt donations, limited-term notification. Approval under section 35AC designates the listed institutions and their specified projects as eligible schemes for tax-exempt donations, naming each project and its estimated cost. The notification lists three institutions with corresponding projects and estimated project costs. It further states the notification's temporal limit, remaining in force for a three-year period applicable to the specified assessment years, thereby setting the time-bound scope for eligibility under the provision.