diff --git a/README.md b/README.md
index 4594f73436a37851ce47ee222dd63655d5c21bdd..ad9ba0895937eece53766498a80b40d28c40e467 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ To use moondb module, simply do::
 
     >>> import moondb
     >>> s_12023 = moondb.get_specimens(sc=['12023'])[0]
+    >>> print( type(s_12023) )
+    >>> ", ".join( (s_12023.mission,s_12023.landmark,s_12023.specimenType) )
 
 
 # How to cite MoonDB and python-moondb
diff --git a/moondb.egg-info/SOURCES.txt b/moondb.egg-info/SOURCES.txt
index 4242a29f3bcf5f73a0285bd9cb6a683a14d93d43..c9a8f6b8b802cd0947f142608aa6dc1f3939f111 100644
--- a/moondb.egg-info/SOURCES.txt
+++ b/moondb.egg-info/SOURCES.txt
@@ -1,9 +1,10 @@
 MANIFEST.in
 README.md
 setup.py
-examples/Apollo11_soils.py
+examples/Apollo12_soils.py
 examples/example1.ipynb
 examples/specimen.py
+examples/specimens_weight.py
 moondb/__init__.py
 moondb/core.py
 moondb/helpers.py
diff --git a/moondb/__pycache__/core.cpython-37.pyc b/moondb/__pycache__/core.cpython-37.pyc
index 0816258664bb2a023d963806c0222da6c1df54df..3e84a83b96fb9e96ab990777c04a0cb101df45da 100644
Binary files a/moondb/__pycache__/core.cpython-37.pyc and b/moondb/__pycache__/core.cpython-37.pyc differ
diff --git a/moondb/core.py b/moondb/core.py
index a062a1ceb1592f3b8c46bbf89ec201fed028f065..8083d633199e598b4911a488202d3fd74f2e06c8 100644
--- a/moondb/core.py
+++ b/moondb/core.py
@@ -173,8 +173,8 @@ def get_specimens(sc=None,mn=None,ln=None,sty=None,ste=None):
    sp_list = []
    if sc:
       for s in sc: 
-         count,spec = _get_resp('/specimen/'+s) 
-         sp_list.extend(spec)
+         spec = _get_resp('/specimen/'+s) 
+         sp_list.append(spec)
    if mn:
       for n in mn:
          count,spec = _get_resp('/specimenlist/mission/'+n) 
@@ -289,7 +289,6 @@ class SpecimenFilter:
    samplingTechnique: list = None
 
    def get_results(self):
-      #res_list = get_specimens(mn=["Apollo 11"])
       res_list = get_specimens(sc=self.specimenCode,
                                mn=self.missionName,
                                ln=self.landmarkName,