India Post has issued stamps on some  common themes of Institutions, Events etc which are similar in nature or are related with each other in some way or other on different dates commemorating their  Anniversary, some special events or other occasions. The collectors with creativity have made covers with combination of such stamps duly cancelled on respective dates. Such covers show the creative efforts of the philatelists.

Here on this official cover, stamp of Kalia Bhomora Bridge dated 14-4-1987 is combined with stamp of Landmark Bridges of India issued on 17-8-2007 with cancellations of respective dates.