Magnolia seeds tend to require moist stratification, meaning that not only do they need the chilling period to mimic winter (stratification), but they cannot desiccate during this period. Pawpaw and several other native tree and shrub species have similar requirements. This could be as simple as keeping the cleaned seeds, free of berry pulp, in the 'fridge with a slightly-moist paper towel or vermiculite, but you could experiment with direct-sowing them as well, or potting them up outside with protection from animal predation (like from mice).

William Cullina's book Native Trees, Shrubs, and Vines provides propagation tips for each genus he discusses in the appendices, including Magnolia. The arboretum of Swarthmore College has a brief article about Magnolia seed harvesting and storage, as do a few other Extension web sites (like this one for Cucumbertree Magnolia), though the information isn't extensive. One resource for Southern Magnolia mentions a quarter-inch planting depth (plus a light mulch over top of that), but we don't have enough data to say if that applies to all Magnolia species or how sensitive the seeds are to exact planting depth.

Miri

There are multiple hickories that are native to the Maryland area and we are not experts at identifying the nuts.
We suggest contacting your local Baltimore County forester or forestry board for direction. You can find contacts here: 
https://www.baltimorecountymd.gov/departments/environment/forestsandtrees/index.html


Christine