The Book(s) of Needs - Great and Small. In Greek the term is euchologion “book of prayers;” in Slavonic we call it the trebnik - “book of needs.” Either title is appropriate, but the latter tends to make more sense to me personally because with a few exceptions, the services in the Book of Needs are mostly those not associated with any particular point in the Church calendar, but instead done as the need arises, e.g., funerals, baptisms, crownings, etc. Some of the services that occur at fixed times are also included, like the Great Blessing of the Waters, which, while it’s done on Theophany, can also be done at other times in the year if the need arises, i.e., we run out of holy water - which is a good problem to have!
The Great Book of Needs is broken into four volumes, more or less in an order that makes sense for their frequency of use in the parish. Volume 1 has the services most associated with the Holy Mysteries, taking you through the liturgical life of the Church with the entry into the catechumenate, baptism, chrismation, the churching of women, etc. Volume 2 centers around the stuff in the parish, how to sanctify ecclesiastical items like icons, crosses, vestments, and so forth, as well as a few services from the liturgical year. Volume 3 is mostly connected with death, funerals, burial, commemorations for the departed, as well as a few general blessings and prayers for specific needs. Volume 4 is where we find the molebens, supplicatory services, and other blessings.
The Small Book of Needs is about what you would expect, given the name - it’s a smaller, one-volume version of the trebnik that has the services most likely to be done away from the parish building, outside the temple, and so on. An upcoming example is the service for blessing homes following the Theophany - it’s in there, as well as a bunch of blessings of a number of agricultural things, from new bee hives to threshing floors! Importantly the small book also has the bedside services for the ill and the dying, prayers for those about to take a trip, blessings for vehicles (and airplanes, if you happen to get one). Both are neat and certainly not anything reserved just for the clergy - if you’re curious just ask and we’ll be happy to show them to you! :)